Definitions for "Guide Coat"
Keywords:  primer, splotchy, sprayed, sanded, coat
a very light mist sprayed over the cured primer used to detect imperfections, low areas or scratches
a VERY light, splotchy coat of contrasting color
A light coat of contrasting color sprayed on prior to sanding a panel. This this layer of paint is removed while sanding and acts as a guide showing low and high places in the surface indicating when the panel is prepared properly.