I've used:
Vallejo Airbrush primer (applied with a hairy brush, but usually only on metal models)
Derivan Minis brush on white primer, on plastics
The Vallejo isn't great because of the lack of adhesion a spray gives you to metal, but it does the job if handled carefully and sealed after.
Derivan brush on takes a little fiddling to get nice coverage, but I also haven't found any particular brush on primer to be "great,"
Many people seem to use gesso (white or black) on their minis with success, but I haven't tried it.
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