Been there done that!! And you are right its not fun! But scraping will take a lot off. Just be careful not to dig into the gel coat!!
Even after soda blasting your not done, you will need to paint with barrier paint then a top coat, in it stays on trailer there will be no need for anti foul.
He may be right the paint, with water will not clean up that easy, I would scrape what will come off, and wait till spring for the blasting.
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1986 V20 
Old Fishermen never die, we just SMELL that way!!
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