Will from Hold Fast Marine Channel is giving us a great primer on how to apply gelcoat using a common spray gun
TotalBoat-488419 Marine Gelcoat for Boat Building, Repair and Composite Coatings (White, Quart No Wax) : Sports & Outdoors
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Tips for Spraying Gelcoat from Hold Fast Marine – TotalBoat
TotalBoat Spray Thinner 101
Fast-dry reducing solvent used to thin most 1-part TotalBoat paints, primers, and varnishes (approximately 10-20%) for spray applications. Can be used as a brushing and rolling thinner (approximately 5-10%) in cool weather (below 60 F). Use as a surface prep solvent to remove surface contaminants, also removes paint from spray equipment and other painting tools.
TotalBoat Spray Thinner 101 (Gallon)
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HOLY CRAPthis GUN shoots GELCOAT Like a BOSS!
How to Spray Gelcoat - Preparing Gelcoat for Spraying