1.NounA (usually glossy and durable) transparent coat sprayed over the pigmented coats of a paint job or similar coating.
"This car has an excellent clearcoat. It's very tough and scratch-resistant.; I sprayed a clearcoat over her pastel drawing, so it ought to last many years without smudging."
2.VerbTo apply a clearcoat.
"I clearcoated her pastel drawing, so it ought to last many years without smudging.; A: What job are you on this week? B: They've got me clearcoating. I'm good at clearcoating without getting any runs, so Bill will probably keep me on it."