> That is cool, Ive thought about it but the budget said no...

> Careful with that foam. Closed cell? It could absorb water and really
> create a problem if not. Also, should there be a problem underneath it it
> would be difficult at best to fix. I like the peel-ply idea! Is it only
> used on the final fill coat?

Good point about the Instafoam. When I use it on the plane I'll see if it forms closed cell foam. On the plane, of course, it's glassed over and sealed.

I use the peel-ply on all my heavy lay-up (stong points on the plane can be 10 or even 20 layers). Use it anywhere you won't immediatly be adding a second layup of glass (pull it off just before you glass the second layer and skip the sanding), or where ever there is a seam.