topcoat

As nouns the difference between basecoat and topcoat

is that basecoat is the undermost coat of paint, etc, over which subsequent layers can be applied while topcoat is a light overcoat.

As nouns the difference between coat and topcoat

is that coat is (lb) an outer garment covering the upper torso and arms while topcoat is a light overcoat.

As a verb coat

is to cover with a coat of some material.

As nouns the difference between topcoat and topcoat

is that topcoat is a light overcoat while topcoat is a light overcoat.