Join Date: Jun 2004
Location: West Michigan
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There have been a few commercially made boats that were plain uncovered styrofoam, it does make for a nice solid boat.
Typically, if you look around you'll see styrofoam cups and floats for swim docks etc, that have 'erosion' at the waterline from all the crud in the water. A layer of fiberglass would work nicely to protect it from that.
If you do the fiberglass, adding runners on the bottom will allow for sacrififial wear strips and keep the boat useable for a long while.
Cheap is good, but if you have to keep replacing something, it's no longer cheap.