How many layers of topcoat you should put on depends on surface and product, but general rule is two coats of topcoat for best coverage, durability, and even finish. For interior and exterior house walls, after primer and undercoat, apply two coats of topcoat paint, as one coat often shows through, has uneven sheen, and is less washable, two coats provide true color and durability lasting 5 to 10 years. For wood trim and cabinets, two coats of paint topcoat plus optional one to two coats of clear polyurethane topcoat for extra protection is common. For wood floors, three coats of polyurethane topcoat are recommended for high traffic. For automotive, two to three coats of clear topcoat over base color are standard for gloss and protection. For nail polish, one coat of topcoat is usually enough, though two thin coats can add extra shine. Applying too many thick coats can cause runs, bubbles, and slow curing, so apply thin even coats with proper drying time between, usually 2 to 4 hours for latex, light sanding between coats for wood. So two layers of topcoat is standard for walls, two to three for cars and floors, one for nails.
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