Re: coring w/ urethane foam sheet?
Hey ya can't try it if you don't buy it.!
BTW, it works the nuts.!
I peeled the silver backing off a 10x10 inch square sheet,
slit into 1 inch squares with utility knife, not cutting through the blue backing on the other side, its slices very clean.
I placed it over a compound curve (couple of old tools on the bench) , mixed up some poly with cabosil, catalized and worked it into the slits with a putty knife, then pressed mat onto that and wet out the mat with straight unthickened poly resin w/ a hot shot of mekp, it got REAL hot and set rock hard after 10 minutes in the sun.
I did kinda slop a lot of resin on the matting.
The urethane I grabbed is spongey soft like extruded styrene foam, don't know if you would want to walk on it but for coring my roof its gonna be perfect. Absolutely no reaction with the resin.
So the plan is to use the whiteboard I was originally going to use for the roof as a mold surface, heres my plan,
cut whiteboard to outline to the shape of roof,
apply modelling putty around the perimeter to form a molding lip,
wax/polish x4 and lay up 2or 3 layers of mat,
apply the foam with poly resin putty ,
after it sets, peel the backing off the urethane foamboard...
and then mat/resin over the whole shebang.
Install some hard mounting points for mounting to the steel tube framework. (ply?).
Pity I don't have any more resin now.
