Two revolutions have taken place in the boat-building industry in the past few decades. The first, of course, was the shift from wood to fiberglass construction, but the second is much more subtle, as the bewildered buyer above has just found out.
Foam sandwhich construction is very common in boat building. If you use the right foam with the right glass and the right resin it will be fine. To get a better answer that this you will need to be a bit more specific as to what you are hoping to do
The roots of fiberglass boat building go all the way back to the 1930's when, so far as I know, the first reinforced plastic boat was built by Gar Wood in 1936. ... That's why you see foam cored boats with painted dark trim, or dark gelcoat colors, that look like a checkerboard. ... Mr. Schofield in Proper Evaluation of New Core Materials, same ...
Foam Core Materials in the Marine Industry by Trevor Gundberg, Composite Materials Engineer with DIAB Inc. For over 60 years foam cores have been utilized in marine applications to lighten, stiffen, and strengthen everything form hull bottoms to fly bridges.
Foam Core Composite Panels This material is used to fabricate lightweight interior or exterior parts. Cockpit and salon tables, hatch covers, fish boxes, settee tops, non-structural partitions and bulkheads, swim ladders, sliding doors for fish boats.
We used polyester resin and glass cloth laminations over a core of rigid urethane foam boardstock (fiberglass over foam). Modern variations sometimes use an epoxy resin or vinyl-ester resin and carbon-fiber-cloth over urethane foam, like the composite used to build GM’s Ultralite experimental passenger car.
Foam Core Boat Building Made popular by big expensive custom race boats in sail and power, foam core boatbuilding is now becoming more and more common on boat production lines around the world. The reasons for this are quite clear.
Discussion of cored laminates in fiberglass boat construction. Home ... This is why some builders insist on building only solid hulls and others will core a hull above the waterline, but never below it. ... but are more likely to crack when crushed. The most expensive commonly used foam is Core-Cell, which is a styrene acrylonitrile (SAN) foam ...
Overview of the hull building method: We will create a foam hull shape around a wooden jig, fiberglass the outside, flip the hull, remove the jig and fiberglass the inside skin.