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Only use acrylic on a vinyl kit. Oil based paints (laquer, enamel, and oils) will never fully dry - they will always be a little tacky - and in some cases will attack the vinyl.
I always cleaned the pieces before painting with a tepid water and just a little soap. For a base coat/primer I airbrush right on the vinyl. Most primers are oil based, and acrylic seems to stick just fine to clean vinyl.
Hope that helps.
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