There should be specs on finish and base requirements available for the products your using to refinish the boat. I dont have any experience with gel but in the auto refinishing world theres a ton of different specs that are made for each specific paint and primer. You'll want the grits to be spot on and coverage depth to also meet needs. That said I had some work done on mine last year and using black gel no primer the refinisher was able to cover things very well using only gel. Learning a ton here, keep it up!

