Need some tips/help regarding sealing plywood with fiberglass resin and cloth

[wpg manitoba]

So basically I am converting a 5 by 10 foot utility into an enclosed cargo trailer. I built the roof with flat pywood and am wanting to make sure I seal it properly. My question is would a couple of coats of resin be enough to seal the plywood or do I need to put another coat of resin with cloth? I don't know much about this topic. I am on a budget and If I don't have to use the cloth I would like to know because it's so expensive. When I am done I will be topcoating with oil primer and top coat.
Any help/tips are greatly appreciated

 

[jbcurt00]

Polyester resin or epoxy resin?

They arent the same thing. Polyester REQUIRES fiberglass cloth/mat.

 

[wpg manitoba]

Not sure. I used Bondo Fiberglass resin. I brushed on 2 coats of bondo fibergass glass resin. Then on the 3rd coat I used the resin with a sheet of fiberglass cloth. I am planning on topcoating with primer and topcoat of oil paint (tremclad). So you guys think this will hold up, or did I botch it?

 

[Woodonglass]

Nope that's pretty much how it's done except...How long after the first two coats did you apply the fabric? Bondo resin has wax in it and if you let the first two coats dry/cure for a few days then the wax will have surfaced and can/will cause adhesion problems for the fabric. Also when using poly and glass you pretty much need to use Chopped Strand Mat first and then the cloth/fabric. If not, again, you will probably have issues with delamination of the fabric. It's also important that there are NO bubbles in the lamination.

 

[mickyryan]

^^ could not have answered any better good luck let us know how it turns out pics would be cool too I love seeing folks doing glass work on other things besides boats