Vinyl plasticizer spewing
I think you should remove the sticky plasticizer before you start painting. It is actually a partially crosslinked liquid that was added to the vinyl to make it flexible. After many years the compound degrades and the plasticizer leaches to the surface. There are a number of cleaning products that will dissolve it including "Spray Nine". Then you can paint over it with the solvent based primer and not have the plasticizer dissolve in it and wreck the primer.
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