How To Fiberglass Over Plywood

In this video I am using laminating poly resin, 1.5 oz csm and 1708 bi-axial glass. In order to ensure a good bond onto the plywood it is essential to pre-coat the surface with resin! Not doing so will almost certainly result in a dry layup and de-lamination 🙁 Not good…

In total, I used 12oz of resin to pre-coat the surface and layup all the glass shown in the demo. The fin roller I used to establish the radius on the fillet is 1/2″ and I used a router with a 1/8″ round over bit on the top edges. I knew this was going to be difficult to make the glass conform to such a tight curve but I wanted to see if it would work. It did, but I would strongly recommend that if you need to do something like this, a larger radius would be much easier! At least 1/4″.. 1/2″ would be better if the application allows.

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11 Responses to “How To Fiberglass Over Plywood”
  1. rob wight says:

    very good – it reinforces what I learned from your other videos.

  2. Marits says:

    Hi Andy,
    I’ve just recently”stumbled” onto your website and lordy lordy, am I ever grateful for this stumble!
    You have given me so much information on things that I was leery to take on, that I feel very confident in what I need to do to make my 34 C&C a much better vessel. Especially your tutelage on fibreglassing.
    One question..would you recommend VHB sealant for the windows or port lites on my boat? I’ve used Plexus in the past, but that led to greater issues. Body filler under the gelcoat was torn off the fibreglass by the flexing of the boat, leading to leaks of course!
    I sure do appreciate how you’ve formatted your tutorials and how you speak in plain English. It’s refreshing to actually see someone present so clearly!!
    Thanks Andy and heck I`d like to hang out and learn more about boat repairing. I kinda love it myself.
    cheers and Happy New Year! Marits

    • ~Andy ~Andy says:

      Hi Marits!

      Thank you for the kind words!!!

      Yes, the VHB tape is a much better choice for installing plastic (frameless) portlights! The tape will allow movement of the polycarbonate as it expands and contracts with temperature. I don’t believe Plexus does this as well. I’ve found the best pricing to be through Zoro tools, or on Ebay.

      Hope this helps!

  3. Mike Givens says:

    Hi Andy,
    Looks like you are doing well. Quick question. Do you catalyze before making the peanut butter or after mixing?
    Thanks Mike

    • ~Andy ~Andy says:

      Hi Mike!

      I do prefer to catalyze the resin before adding any other material. It just makes it easier to ensure that the resin is properly mixed 😉

      Hope this helps!

  4. Luke says:

    I learned a lot from this video! I just bought a Thunderbird that’s in great shape except that the shelf running around the inside perimeter of the hull is rotting out. I can imagine using the techniques in this video to attach a new 4″ shelf to replace it. I still need to figure out how to cut the shelf to match the curve of the hull and how to hold it in place while applying the fiberglass layers. Do you have any suggestions?

    Thanks so much!

  5. Peter says:

    Hi Anndy
    I have a boat that I am fixing up found your site
    And OMG has it helped me
    Would like to say thank you

  6. Leo says:

    Hey Andy,

    Really great website. Great help for a beginner like me. Would this technique apply with Divinycell.

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