I don't. My color dries flat, that seems to give grip enough. I use acrylics, cheap ones at that, and they stay stuck to etex. The few that do peel, have peeled all the way down to wood, so I figured poor sealing.
He that would make his own liberty secure, must guard even his enemy from oppression; for if he violates this duty, he establishes a precedent that will reach to himself.
Thomas Paine
Threaded Mode