Recommended Expoxy Thinner

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Recommended Expoxy Thinner

Postby Onajourney » Fri Aug 05, 2022 1:40 pm

Anyone have a recommended epoxy to use for sealing the plywood before skinning with aluminum? Also, preferred thinner and ratio to use to roll on? There is a ton of dialog on this here but I can't find these specifics. Thanks
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Re: Recommended Expoxy Thinner

Postby Capebuild » Fri Aug 05, 2022 5:51 pm

I'll share my experience which may have nothing to do with your "technique" of applying the aluminum.... I used contact cement to apply my aluminum to the ply sides.
Prior to applying the aluminum I coated the ply with 3 coats of urethane. Big mistake. I had to wind up sanding it all off back down to the bare wood. So depending on how you're applying your aluminum (and whether you float it or not) you may want to give some thought about whether or not the wood should be sealed. My 2 cents.
John
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Re: Recommended Expoxy Thinner

Postby Onajourney » Fri Aug 05, 2022 6:51 pm

John- Thanks. Like so many things here, there are numerous ways to do things. My plan is to epoxy ~12" around all corners (my is a squaredrop) and use a minimal amount of contact cement to assist this one man crew to skin the aluminum. SO you are saying do not epoxy anything? I am ok with that but Tony beat into my head to epoxy everything. If you had to do it again, what would you do?
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Re: Recommended Expoxy Thinner

Postby tony.latham » Fri Aug 05, 2022 9:43 pm

Onajourney wrote:John- Thanks. Like so many things here, there are numerous ways to do things. My plan is to epoxy ~12" around all corners (my is a squaredrop) and use a minimal amount of contact cement to assist this one man crew to skin the aluminum. SO you are saying do not epoxy anything? I am ok with that but Tony beat into my head to epoxy everything. If you had to do it again, what would you do?
If it were me, I would use Raka thin set epoxy and float the aluminum.

Tony


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Re: Recommended Expoxy Thinner

Postby Capebuild » Sat Aug 06, 2022 6:52 am

If you plan on "floating" the aluminum, then I'd follow Tony's lead. If you are planning on using contact cement to adhere the aluminum to the ply (not floating it) I'd not seal the wood. I had spoken with 2 tech reps from Wilsonart after I had sealed the wood with urethane and both had said the urethaned surface would compromise the bond. I suppose the contact cement is adhering to the urethane and not soaking into the ply as it should (if the ply were uncoated) .....so now the contact cement could just pull up the urethane and separate it from the ply. So I guess it all depends on how you plan on applying the aluminum.
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