Sub Boxes

I don't know if this will work, but maybe it hsa already been tried. At Home Depot today and ran across the expandible foam. I wanted custom fit boxes for the subs in my Supra. Taped newspaper to the area where the box would be and then sprayed the foam. It formed nicely to the shape. I plan to fiberglass over the foam and then cut the foam out from the inside. Do I need to worry about getting most of the foam out or will this help it. I will try and post some pics later.

Doug, after you fiberglass over the foam won't the box be bigger than the space you foamed

yes but the shape would stay the same. Hopefully I can work on it some tonight.

Doug,
I have used styrfoam before as a mold to glass on to but never the foam in a can. If you can get it the shape you want then I don't see why it won't work. Good luck and let me know how it turns out!

Here are my boxes in finally!!!