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saywhatthat wrote:that sample I sent you is just ploy resin over the right foam Why do all the extra work and cost?
Pmullen503 wrote:Either of those would work. The heavier, the more dent resistant. However, you can steam out small dents.
I suspect it will take many coats of polyacrylic to fill the weave.
Pmullen503 wrote:If that paint barrier fails, polyester resin will dissolve the XPS foam and all your work is trashed. Polyisocyanurate foam can be glassed with polyester resin.
I think I've ruled out the Polyester Resin now. Cost cost savings is little for the risk and added time/labor. Weight savings is seems to be 25%, again not really enough to be concerning.
Try a small project with both and make up your own mind. Polyester is really unpleasant to work with.
And here I though it would be better to work with.. Seems like strike 3 to me.
If finish is your priority, use the material that lends itself to that. It's difficult to get a really flat smooth surface over foam. Something that looks good under glossy paint. The foam is too soft, even with glass over it to sand it truly flat and straight. I would use either a surface material that has the look I want or fiberglass and epoxy over plywood for paint.
This will be on a boondocking camper so blending in is more the thought. No high gloss for me!
A foamie is what it is. You get lightweight, easy and cheap construction. You also get a certain kind of finish.
We use Polyisocyanurate foam Can get at any box store home depot ..There so much BS on the webWgreygoos What specific type of foam are you using and where are you located ? They type of foam that you are using may not be available in all areas. Thank you
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