Shave? Like with a cabinet scraper, safety blade or a Gillette Quatro?

Here's the West Marine options:
  (You need to Login or Register

Yikes that stuff is pricey! Honestly, a syringe of the half or one hour (whatever) epoxy will easily coat the entire bottom of a canoe. Use a margarine tub for a mixing pot ... comes right off when cured should you wish to reuse it.  ;)