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Message: <blockquote data-quote="fwman1" data-source="post: 493174" data-attributes="member: 31515">Lammichael6499, I was unaware of Coosa Board till your post.  I did some quick research.  It is more appears to be much more structurally rigid.  Weight is about 1 pound per square foot at 1/2" thickness.  A 4x8 sheet of 1/2" is ~350-370 dollars.  I think that you would end up with less weight per square foot using Coosa Board, but couldn't find any load bearing examples in my quick search.  I'm sure they are out there.   My front deck could use a 4' X 4' sheet, so there is a large savings there if you can get by with less than a sheet. The FRP is flimsy, but dense and tough. It is very water resistant as well.  I'll be straightforward to say that I'm a beginner at this, no expert at all. I just thought this might solve some issues I was having engineering a front deck for my jon boat.  Since I didn't find any evidence of people trying the FRP/EPX/FRP sandwich, I figured, what the heck.  I was going to do my mid-section with FRP board anyway, so I had everything except the epoxy to test it out.The 1' X 2' test panel is curing now.  I'll let it sit overnight and do some preliminary checks tomorrow evening.I will add that I have 30+ years experience building giant scale RC airplanes.   I have done a lot of work with foam, fiberglass cloth, fiberglass and epoxy resins over the years and am comfortable working with them.</blockquote>