Nearly all boat painting projects involve pre-paint surface preparation ranging from scraping old paint to priming bare hulls. In fact, the adhesion and durability of the finish is almost always directly proportional to the quality of surface prep. Paint primers and undercoats are used with marine paints for maximize adhesion over old paints or bare aluminum, fiberglass, steel, and wood hulls. For the best results, it's critical that manufacturer's painting conditions guidelines be followed. Ambient temperature can significantly impact dry and recoat times. Various thinners and additives are used to speed up or slow down paint drying time. The use of paint thinner solvent
or other additives also depends on whether you are rolling, brushing, or spraying.