Thought I would give a detailed explanation of how to replace the core of your boat. In this example we use a balsa core, but the princple for other core materials is the same. Watch the previous episode (94) to see us removing the core.
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Edited by Colin

  • Harry Buthelezi
    Harry Buthelezi

    That was too short, waited for the whole week for 11 minutes come on man you can do better than that, where are the Spanish chicas I thought they are going to take care of filming and editing

    • bobdhitman

      @Sailing Parlay Revival - You’re a fucking machine Colin!

    • James Birkin
      James Birkin

      @Sailing Parlay Revival you dont want grey hairs - at 64 I have too many of those

    • runningfromtheherd

      @Mr. Finance prolly too late by now. damage done

    • Mr. Finance
      Mr. Finance

      @Sailing Parlay Revival It can't be good to breathe all the dust and gases from fixing a boat like that! Should be wearing a mask at least.

    • Ima Crazy Guy
      Ima Crazy Guy

      @Sailing Parlay Revival You are doing amazing, man! Hardest job of a solo youtuber is to try handing the reigns off to someone else to provide the quality content. Its a struggle, but the end result is most important! Keep kicking some ass! Heck of a lot of hard work, anyone who has had hands on work with this process knows just how it fills your entire day sunup to sundown!

  • Gregory Delozier
    Gregory Delozier

    You do amazing work glad people like you restore these boats instead of junking them

  • Ивайло Иванов
    Ивайло Иванов

    Absolutely beautiful repair job!

  • Yorkazuna

    A rubber mallet goes along way in helping seat patches like this.

  • Island Mike
    Island Mike

    Epoxy is NOT waterproof.. All resins take on water in more or lesser quantities...Btw hope you let that balsa dry out completly..

  • David Tweddle
    David Tweddle

    Great job. Your" Can do" attitude is infectious. The yacht is coming along very nicely. Good luck and keep safe.

  • nicholas sanfilippo
    nicholas sanfilippo

    Great vids man. Love the intro especially so true about looking back in 20

  • Godfathers

    Glass party

  • James Birkin
    James Birkin

    so helpful - thank you for this - love the tech side of boats -

  • james aughton
    james aughton

    When the students become the masters! Best and most inspirational on SVsoft by far. Much love brothers x

  • Oliver Heyer
    Oliver Heyer

    I wonder where the Mast went - or isn’t it a sail catamaran ?

  • Graham

    At least it's a balsa core, although extending it below the waterline is madness. Foam cores are a nightmare when they go wrong, which they usually do.

    • Graham

      @James Birkin David Pascoe from 'yachtsurvey' goes into some detail, including how the hydraulic loading of a soaked core (causes by battering against the waves) causes chaos as the boat is used. It ends up with two think GRP sides with a smelly mush in the middle, and an astronomical bill to fix it. It's only really used to save resin, 1970s boats are generally a bit tougher! For me however, steel is the winner: strong and easy to fix!

    • James Birkin
      James Birkin

      @Graham thank you

    • Graham

      @James Birkin They always end up waterlogged. Balsa is stronger, sticks well and resists rot. Foam is a lost cause, never buy a boat with foam below the waterline: or anywhere, if possible. The proper way is no foam below, and only balsa above. Oh, and the use of roving everywhere with strength or water: chopped mat is hopeless for osmosis (the short strands have many ends) and strength.

    • James Birkin
      James Birkin

      what are the foibles of foam cores v balsa?

  • Robert Tanas
    Robert Tanas

    I have a boat on Lake Michigan I mean they have to get me a SVsoft channel and make money to spend my Summers out there

  • Joe Robilotta
    Joe Robilotta

    Great work

  • rivercarplife

    Great channel, you guys do a thorough job. Looking forward to the final product ✌🏼💚👍🏻

  • john Kemple
    john Kemple

    Okay I have a question....the perfectly square corners on the area to be repaired..They used to make airplane windows square but found the sharp corners were a structural weakness due to the cracks and stress on the sharp angled corners. Why not make those corners round or with a radius? at least on the hull part of the equation. Easy enough to do with a hole saw. Just curious like the channel and everyone. But I had to ask this question..stay afloat..

  • Chris_R

    Lovely job, any reason you dont use a vacuum and peel ply? you would get a far more even repair.

  • Ronald Hess
    Ronald Hess


  • Kurt Adams
    Kurt Adams


  • AC Cowie
    AC Cowie

    She had a great question at 6:35 "what happens if you get air bubbles?" Colin ya didn't answer properly. Why do you have to sand them and get them out? I'm binge watching this.

  • Ian v Curtis Fine Art Sculptor.
    Ian v Curtis Fine Art Sculptor.

    A bit of advice for future repairs, Because the material you are bonding too is well cured grp, Ideally you would have brushed on a primer coat of well catalyzed 2 percent MEKP epoxy vinyl ester resin to really bite into the old material, I was in sxm in the 90s after hurricane Luis as few of my mates were rebuilding hurricane boats, and they had issues with delamination after major hull repairs, It might have been prep, or maybe poor resin, but you cannot beat epoxy vinyl ester, I used to make RTM molds for a US boat builder (sea ray) and was a superyacht chief engineer, in the states. good luck fair seas, and keep it wet side down.

  • david aharon
    david aharon

    Love your video my name is David and I'm looking for cheoy Lee ketch 45 to 53 project is okay to if you know any please let me know

  • WSario

    Great job...Thanks for sharing...

  • Mike

    When's the next video update on this project?

  • Nick Twaddell
    Nick Twaddell

    What hole?

  • Dj Boogieboy
    Dj Boogieboy


  • coco Boo
    coco Boo

    Bulsa is that cork board

  • Falney

    Just bondo then rattle can it. No one would be the wiser!

  • RogerThat

    Jupp, no shit! Hahaa

  • jose guerrero
    jose guerrero

    Excellent work 👏🏻👏🏻👍👍

  • James Lanier
    James Lanier

    Hats off to you.. Fiberglass work in a tank and shorts..

  • Till

    Hi, Unfortunately, you made some serious mistakes in your repairs. especially with the large fiberglass parts, the transitions are too sharp-edged. You should have sanded the transitions much more gently so that a large-area connection is created between the old and the new laminate. This way, there are no weak points. In your approach, you built a predetermined breaking point into the boat. I am sending you a link that tells you how to do it right. The video is in German, but just in the pictures you can see very well what I mean. So it's done right. And above all, the hull retains its stability. Greetings from Germany.

    • james Bard
      james Bard

      Also should have used a vibrating roller on the balsa core to imbed the resin through the core

    • Sadnoize

      @Island Mike the guy is right, you can say “ok professor” and make fun of what he said all you like, but the fact is, the guy in this video just snapped his boat in half and is in hundred of thousands of dollars debt because he didn’t do the job right the first time I’d reevaluate your dumb ass comment lol

    • Island Mike
      Island Mike

      Okay professor

  • Adam Spees
    Adam Spees

    You put the layers of fiberglass on in reverse. The largest piece goes down first. The smallest goes down last. It is the opposite of common sense. If you imagine the layers there is a small air gap at the very edge of each piece buried under the next layer. The non strucutural resin fills that little void. However if you do the correct order(largest to smallest) there are no edges. They blend seamlessly when you fair. Look it up.

    • Adam Spees
      Adam Spees

      @Sailing Parlay Revival Another technique we use to save time is to cut all of the patches the same diameter. Imagine a hole that is 10" round after its ground back. We cut 4 pieces (or whatever the original laminate was) at 11" diameter. Lay down the first one. We it out until it hits the good gel coat. 1/2" of dry fiber is sticking out all the way around. Each layer is added more dry fiber is left, only wetting out what needs to be wet. When its cured you can quickly grind off the dry fiber, leaving the proper amount of wetted out glass. Keep in mind that the 1st layer covers the core and all of the ground glass. The rest simply lay on top. When you grind it flat it looks exactly as if you cut different size circles putting down the largest 1st. Cheers, Adam

    • Sailing Parlay Revival
      Sailing Parlay Revival

      With all due respect this is just not true.

  • Xbox SeriesX
    Xbox SeriesX

    Hire an artist to paint your boat. Crowdfund it! I’ll throw 50 in the hat

  • Steve Turansky
    Steve Turansky

    I'm no expert but from my experience building a boat (and being a landlord repairing wall holes), it's far easier to fill a low than to sand down a high, on a surface. Nowadays when a tenant is moving, I tell them I'll fix holes free, please don't touch them. Because once the filler is dried, it's really hard to knock down a high w/o causing much more work.

  • Steve Turansky
    Steve Turansky

    Boy boat repairs are so freakin easy when you are doing them. Reminds me of a saying - "I Love work, I could sit and watch it all day". Great job documenting this difficult procedure - Can you imagine how much harder it would be on the bottom of the hull, applying these layers overhead? Enjoy your beer tonight for tomorrow the fun part starts - Fairing...

  • pangrac1

    Vinylester is alsou more nasty to ypor health and enviroment than nasty polyester.

  • Atlantis Atlantidas
    Atlantis Atlantidas

    Colin I just saw you in BELOW DECK SAILING at the BRAVO Channel. When did you film the series??? Apparently this was just film in CROATIA. It is supposed to be coming out in MARCH 2021.

  • Laird Of Dunstan
    Laird Of Dunstan

    Sorry about the Argentina ,all blacks result , Scotland beat England at Twickenham :-) Love the videos , lots of clear guides on how t work balsa code and fiberglass

  • Brody Barrett
    Brody Barrett

    Awesome work!! Great camera crew! Very inspiring

  • Tom Dall
    Tom Dall

    Saw you in the trailer Below Deck Sailing, I guess we’ll see you twice a week when the show airs.

  • Adam wood Life.sunsets .sunrises
    Adam wood Life.sunsets .sunrises

    Nice edit as always, glad its all coming together. Wish i was there to help

  • steve whitacre
    steve whitacre

    I like your videos but, you should be wearing mask when handling the fiberglass mates . Fiberglass in the lungs is a serious safety issue you should be stressing that better safe than sorry when playing with lung health. Also fiberglass doesn't dry it sets. Still I love the videos, and understand there is a learning curve you are dealing with.

  • Rune Martin Guldberg
    Rune Martin Guldberg

    Put in balsa bit by bit. Large parts will always get some pockets of air behind them....

  • Philip Morehouse
    Philip Morehouse

    A big difference in your presentation - much easier to follow and the background music is easier on the ears. I feel as if, by following your directions, that I could easily fix holes in boats, hereto seemly impossible. I really like your show and feel as if I'm shoulder to shoulder helping you along.

  • Brian G
    Brian G

    Does the chemicals smell strong?

  • Austin Garrett
    Austin Garrett

    New bravo TV star in the making btw?

  • Maritime Museum San Diego
    Maritime Museum San Diego

    Great video, but I'm curious why you didn't stop once you had the balsa core in, let it dry, sand, then put the final outer layer of glass on?

  • tommyg265

    Had to Laugh, I've been watching all your videos and now your 5 minutes from where I work! really like your videos!!!

  • bill hanna
    bill hanna

    Hey we gotta give them 'one' win .Coming along well , Now the bluddy fairing .

  • mike9205

    WOW! You lads have become serious craftsmen when it comes to hull repair. This is your best work yet!

  • mikeD

    I'm getting a blister just watching this.

  • Sailing Citrine Sunset
    Sailing Citrine Sunset

    Do you use a fid roller between layers to push the air bubbles out?

  • Neville Williamson
    Neville Williamson

    Bloody good job guys, no short cuts, you certainly know what you're doing, well done from semi retired aircraft and helicopter engineer!

  • Bugha lilley
    Bugha lilley

    I never knew you were a Kiwi like me

  • John Ryan
    John Ryan

    Sorry mate you are supposed to champfer the edges !

  • M Watkins
    M Watkins

    Nice video but was way to short!!! It’s looking good 👍👍🇺🇸

  • Mark Mul
    Mark Mul

    Colin! I just binched all the episodes and i most say i really love the project! Thank you for explaining everything and taking us through the steps. Can't wait for the next episode, even when its "only 11 minutes"!! Take care and stay safe!

  • Pete Bernhagen
    Pete Bernhagen

    Great job with the repairs. It really looks like professional work. Guys are really working together. Getting prepared is key and working with good product and nice weather for the procurement of fiber/filler/balsa/three glass coats and gel coat finish and so.e sanding. REALLY NICE JOB

  • Skytechea

    Good vid Colin, very well explained mate. Im a brit and mad on rugby also, remember the 2019 RWC semi lol Soon after a great win we got our asses handed to us by the SA boys in the final so you cant win them all. Keep it up and ignore the keyboard warriors!

  • Josh

    James! Just saw you in a ad for “Below Deck” sailing vessel in CROATIA on brovo tv. Your famous bro! Love what you guys are doing. Learn a lot. Thank you.

  • Robert James
    Robert James

    so good bro. I love the AB vs Argentina Mention. :) Dude you have mad skillz bro. Watching you apply that gel coat was like ,Dam!' Loving the vids Bro.

  • Steve 1961P.
    Steve 1961P.

    I agree, the short videos are tooooooo short... I fully understand why, but the work you do is really cool and fast. Someone asked what happens if air gets trapped in the glass, I assume they were asking about the type of roller you were using, but you didn't explain that to your viewers.... I don't think everyone understands the puzzle pieces you made for these repairs. Maybe for the next ones, show making the the filler wood and how you size the glass cloth and why the filler along all the edges. Then the dry run and the actual repair. I know I could watch it all day long!!! And don't forget to name the video something very catchy with FIBERGLASS REPAIR in it so it will catch millions of sets of eyes!!

  • Sailing Divergent
    Sailing Divergent

    I'm curious, I'm doing fiberglass repairs myself and it said to mix the the hardner in the epoxy before the silica, is vinylester different? It was explained to me to mix it that way because the silica absorbs the epoxy, if it's not mixed first and absorbs just resin then the hardner wouldn't work properly, now I'm asking a question here so no dumb comments from all the experts.... j.s.

    • Adam Spees
      Adam Spees

      You are correct on the epoxy. It would be a 5:1 or 2:1 ratio by volume.Mix them together stir well and then add your fillers. Polyester & Vinylester are 98.5 % resin 1.5% hardner. The hardener is watery and instantly starts the reaction. You mix the fillers into poly/vinyl resin before adding the hardener.

  • Randy Walker
    Randy Walker

    What’s the outcome of the mast problem?

  • j rain
    j rain

    Have you checked for structure damage due to the crashing into the rocks and all? Hopefully you've checked that out it's kinda like the foundation of a home. I guess it's hard to tell until you install the last and tighten rig.

  • Vivie17

    Yes, like another commenter said, very satisfying to watch!

  • Geoff & Vicki Blackburn
    Geoff & Vicki Blackburn

    And the All Blacks should have lost......GO WALLABIES

  • Ron Monks
    Ron Monks

    Jamie's a treasure. Would share a foxhole with that guy!

  • Swapster .com
    Swapster .com

    How long before the other crew members figure out that Colin actually just flips boats and he gives them a little ride on the refurbs and then goes onto the next flip.

  • Bull Hippo
    Bull Hippo

    Good to see people who know how to use the materials. I would have overlapped the glass larger to smaller, that gives more layers in contact with the surrounding core. Other than that, fantastic job !

  • R Nunez C.
    R Nunez C.

    Well , about time Argentina beat NZ.:).and that balsa core sheet must be from balsa in the world...saludos bests

  • Peter Milne
    Peter Milne

    So - this video is from November - the All Blacks played Argentina and lost I think 15th Nov

  • Christopher Keeler
    Christopher Keeler

    Below Deck Sailing Yacht.

  • Boating Journey
    Boating Journey

    So impressive! You make it look easy, though we know it isn't. Can't wait to see what the end result is. The fact that you sailed it back to FL alone is impressive. Great job!

  • sadick SAERT
    sadick SAERT

    Should you not have angle or chamfer the joint instead of right angle fit

  • Pedro Cartagena
    Pedro Cartagena

    I see we went the opposite direction for music this week 🤦‍♂️😂. Still a dope video!

  • 2L8 Mate
    2L8 Mate

    ABs needed that lost to wake them up. But in typical fashion came back and thrashed them in the 2nd game. To hear you talking about that game was so long ago (last year) yet this video was uploaded yesterday. You must be a busy man...

  • Darryl Ellison
    Darryl Ellison

    Awesome job, I am doing a huge project on a NZ designed Ross 650 yacht, replacing the core for about 4.7m2, I use a multi tool to remove the old core (9mm), from the inside - as the boat is about 16 years old, was recommended to use epoxy, rather than vinylester (originally used) so far so good, not difficult, just all takes time. Great job guys.....

  • Philip Meads
    Philip Meads

    Bravo's Below deck Sailing has a familiar ships engineer if I'm not mistaken from the advert!!

  • ImageLume

    Keep up the good work. Just noticed you have even more sailing content coming soon! Congrats on expanding the audience!

  • Scott Merrick
    Scott Merrick

    I swear I just saw Colin on a Below Deck Sailing Yacht commercial. Anyone else catch it.? Starts in March.

    • ImageLume
      ImageLume Yep. Congrats Colin!

  • Life's Abeach
    Life's Abeach

    That's my boat!!!!

  • WanderLust Scuba
    WanderLust Scuba

    A bit of an abrupt ending there...

  • Gleaning The Scriptures
    Gleaning The Scriptures

    "HIT 21 = Strong" lol

  • y2kxj

    If your want to cut complex shapes perfect at home.. ya need a special tool.. search you tube how to build a ticking stick,,,

  • Luigi Bigtime
    Luigi Bigtime

    Missed a spot brother...

  • Searching Life
    Searching Life

    stoked for u guys !! Epic content . Your descriptions , titles , order . Solid work !!! The amount of useful info your setting people up with is invaluable !! U ever try use the metal roller with the ridges in it ? Didnt see any use of them in the video ? Use the reg roller but then switch over to the metal roller , seems to have many benefits compared to the foam rolling the entire process. Speed , but i really like how it works the glass together kind of. Pulls out any bubbles , and they make all sorts shapes and sizes. Just a thought i had after watching the video. So rewarding . Your adding fuel to my fire now ,, boat search time again .. ALOHA

  • James Bittner
    James Bittner


  • Jane Stewart
    Jane Stewart

    Love your older videos. Unfortunately not loving the last 2. Had to watch this one on mute as the music was horrible. Please please go back to the old way. Your videos were the highlight of my week.

  • John Doe
    John Doe

    If you ever decide to go back onto dry land, you could always get work doing drywall or plaster repairs! Same principle: sand, fill, sand, fill . . . . . . until FINALLY it's perfect!

  • Barrie Gannon
    Barrie Gannon

    Thanks for the video, but can we see something else next week mate, seen enough fibre glass repairs now. Cheers

    • Barrie Gannon
      Barrie Gannon

      @Sailing Parlay Revival that’s the spirit 😁

    • Sailing Parlay Revival
      Sailing Parlay Revival

      You saying I should stop working and go rent a yacht for a week and film it for you?

  • gman the hobo
    gman the hobo

    Hey Colin I'm not sure exactly if you know or not or adjusted for it in some way but putting multiple layers of glass over one another without waiting for at least a sticky test can lead to unseen bubbles in the lower layers from the heat and the pull from the upper layers.

  • Lyfhntr

    Might be time to change the Mark Twain quote. This has become a how-to channel instead of a lifestyle channel. Sorry bro.... all the best. Cheers.

  • justlooking2222

    Leave us wanting Colin, it's a good thing. Forget the football game, NZ will win the America's cup.


    Love your channel. Unfortunately I really don’t think your new video team is smashing it bud... just honest opinion.

  • irefusetoo

    Regular pros at this point

  • Brian Davies Scuba
    Brian Davies Scuba

    Hi Colin Any reason for not using honeycomb core instead of balsa?

  • B Boating
    B Boating

    Hey Colin, Can you add a little more information regards to how much time in between each layer takes to cure. Thanks, mate

  • Go Leafs Go
    Go Leafs Go

    Awesome work, I know if it was my boat you were fixing I would feel very good knowing the workmanship and preparation that went into each and every repair. Better then new when you're finished up! Seems similar to working with drywall trick is to not make a huge mess you then spend an eternity sanding off.