I'd like to build a 4x10 fiberglass on foam core panel. Medium to
light duty cover for a center well. I plan to sit/row on top of it
and use it as a roof for a canvas cabin. Can I use the blue or pink
closed cell foam from home depot or do I need special foam.

I realize I can order end grain balsa or specialty foam but the home
depot stuff would be a lot more convenient and I'd like to keep this
experiment cheap. Will the expoxy/glass stick and will it have the
properties neccessary to function in this capacity?

Thanks in advance.

Tom