Grow a Surfboard - Plant Foam Cloth and Resin

[clay]

Has anyone grown a surfboard and laminated with tree sap?

Over the years I have heard of various attempts at bio or plant based foam, and every time I followed up it was a dead end.  Either they focused on other markets or gave up for some undisclosed reason.

I have more recently heard of nature's epoxy - mixing tree sap with burnt wood ashes.  Information seems scarce and seeing a finished creation even more hard to come by.

I tracked down a grow foam kit supplier and some plant cloth and some tree sap and gave a go at growing a surfboard:

[SUS4Life]

It will be interesting with the grow foam to see if it can get a somewhat constant weight per square foot.
 Do you know what do they weight per square foot? And water resistance or absorption?

[clay]

On thier blog they mention playing around with different densities.