Waterproofing door panel

Finishes, paints and coatings

Waterproofing door panel

Postby Granitedrop » Wed Mar 22, 2023 3:41 pm

I’m planning on starting my build this summer. My plan has my door made out of 3/4 plywood. I want to keep it “bright” meaning the wood grain showing. I’m looking for opinions on how to best achieve this. My first thought is epoxy and a single layer of 6oz fabric. I’ve used polyurethane resin on a canoe repair but hear it isn’t favored. I also have read about “the mix” on this forum. Would it be sufficient to protect the plywood? Other thoughts? Thanks!
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Re: Waterproofing door panel

Postby tony.latham » Wed Mar 22, 2023 4:56 pm

Epoxy/fiberglass it with 4-6 oz cloth and then coat with spar varnish for UV protection. Polyester resin will leave the color of the goo and won't adhere like epoxy.

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Re: Waterproofing door panel

Postby Granitedrop » Thu Mar 23, 2023 8:18 am

Thanks! That confirms my initial impulse then.
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Re: Waterproofing door panel

Postby Pmullen503 » Thu Mar 23, 2023 10:27 am

Do both sides to prevent warping. You want both side to be equally "waterproof". Really what you want is both sides of the plywood to absorb and release moisture at the same rate.
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Re: Waterproofing door panel

Postby Granitedrop » Thu Mar 23, 2023 10:33 am

Definitely. Is there a concern that the sheet might warp in the process of applying to one side? Do I need to apply a light coat of epoxy to both sides before I start laminating?
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Re: Waterproofing door panel

Postby tony.latham » Thu Mar 23, 2023 10:43 am

Is there a concern that the sheet might warp in the process of applying to one side?


Nope, but I agree, doing both sides is a good idea. You should probably do the other side the next day.

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