Coat

[1] A covering of paint or similar substance.
See also anodize, base coat, clear coat, color coat, cross-hatch coat, cross coat, finish coat, fog coat, gel coat, guide coat, intermediate coat, mist coat, prime coat, protective coat, single coat, tack coat, top coat, undercoat
[2] To apply a covering of paint, etc.
[3] Single coat means to apply one layer of material on a surface. Double coat — to apply two coats of adhesive, coating, or sealer to a surface. In spaying, it means to spray first a single coat with vertical strokes and then a second coat across with horizontal strokes, or vice versa