PRIMER=what will key to te subsrte and seal it and key to teh paint
UNDERCOAT=where most of the pigmentaton normally resides
TOPCOAT= a surface more or less resiastant to whatever it is you want it
to be resistant to.
Now many paint do two or three of those functions. exterior emulsion
comes to mind.
So its really down to the paint formulation itself. consult manufacturer.
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