When it dries, it tends to leave a light powdery residue or zinc layer.
That residue prevents good primer adhesion therefore it’s best to remove it. However…, (and this has worked for me… try it on scrap…):
I apply the ZnP and keep it wet , build up a couple coats and eventually it will lightly adhere to the metal without the powdery coat, and dry as a nice coating (and not as the powder residue.)
I have successfully primed over that with good adhesion.
If humidity is becoming a problem - rubbing down with alcohol will remove any possible moisture, or a light rub down with lacquer thinner just prior to priming too. Eastwood’s “ Pre” will assist with that after you prime or before laying down the topcoat.
Last edited by tom moore; 04/06/2023 5:02 PM.
