urathane foam core?

I used it to make a boat like Carolina Skiff does which uses 3x3" "logs" of foam, so you end up with two skins separated 3" with a fiberglass connecting rib every 3". It's not regular sandwich construction.

 

Interesting. I've never heard of that before. How is the boat holding up?

 

The boats fine. Here is the Carolina Skiff patent, which expired a few years ago. When you get there (if you go), click on "Images", figure 4 shows how the glass is laid around the logs. Sam
http://patft1.uspto.gov/netacgi/nph...50&s1=4495884.PN.&OS=PN/4495884&RS=PN/4495884

 

If you go to the site, on the first page that comes up, the one that I said to click on "Images", if you scroll down there is a list of blue numbers. Those are all the older patents that the guy shows to prove that his invention is new and different. They are interesting to look at as they show different ways people invented to make stronger hulls with sandwich type construction. Sam