Re: Spraying gelcoat
The toughest part of spraying gelcoat over a complicated surface like the deck and cockpit is planning your spray plan so that you keep a wet edge and don't trap yourself in a corner. Plan your stop points, and when you think you have prepped enough... keep sanding and filling and sanding again.
IMO prevals are great for touchups, frustrating as hell to do large surfaces. If you're going to invest the time and energy in gelcoat, invest the money for a pair of decent HVLP guns (one will get gummed up when you least expect/want it, so a spare is good), a compressor or turbine capable of the cfms required at the end of 50-75' of non-kinking hose and a swivel chuck, and a decent air filtering system.
It's 5 o'clock somewhere:
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