tack coat(redirected from tack coats)
tack coat[′tak ‚kōt]
A thin layer of bitumen, road tar, or emulsion laid on a road to enhance adhesion of the course above it.
asphalt tack coat
A light coating of liquid asphalt on an existing asphalt surface or on a portland cement concrete surface; used to ensure a bond between the old surface and the overlaying course.