"Washcoat" means a transparent special purpose coating that is applied over an initial stain to protect and control color and to stiffen the wood fibers in order to aid sanding and to which a topcoat is applied.
N.H. Code Admin. R. Env-A 1204.68
(See Revision Note at chapter heading for Env-A 1200) #9933, eff 6-1-11