guide coat

guide coat

[′gīd ‚kōt]
(materials)
A thin coat of paint applied to a surface over a sealer or filler to indicate the locations of bumps or imperfections and thereby to serve as a guide for removing them.

guide coat

A thin coat of paint which highlights the bumps or imperfections in a sealer or filler beneath, and thus serves as a guide for rubbing them down.