This article is from the Sea Kayaking FAQ, by Todd Leigh with numerous contributions by others.
If you want to drag your boat over rocks or drop it off a pier, this
is an important consideration, but even if you don't abuse your boat,
it wears in normal usage as well, so consider durability in your
selection. In general, plastic stands up to abuse better than
fiberglass, but is harder to repair. Keep in mind that in fiberglass
construction, heavier is not necessarily stronger.
 
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