I have a turbine driven HVLP sprayer. I've been priming some cabinets with Zinnsers BIN shellac based primer. Quite often I will shoot a coat late at night and a follow up coat the next morning. In the past with water based finishes I would soak a cotton ball with water and lay it over the air cap and then wrap tightly with a piece of aluminum foil. This worked fine. After doing this for a couple of days with the BIN product my gun was a gooey mess.
In a couple of days I'll be applying the finish coat which is a pre-catalyzed lacquer (Lenmar).
What does everyone do with their guns between coats? The thought of completely cleaning a gun between coats doesn't sound too appealing but better than dealing with a clogged gun.