i had mine done last summer .. you will have to put some sort of paint on after blasting .. it did roughen up the gel in a few areas .. some areas are pretty thin and even with soda, you can blast thru easily.
my plan was to paint my hull anway and do not use bottom paint. i did what lumber did and filled the imperfections, primed, sealed, and sprayed it.
cost was around $400.
good luck
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