"Etching filler" means a coating that contains less than 23 percent solids by weight and at least 0.5-percent acid by weight, which is used instead of applying a pretreatment coating followed by a primer.
N.H. Admin. Code § Env-A 1202.62
(See Revision Note at chapter heading for Env-A 1200) #9933, eff 6-1-11