Personally I would remove all of the existing primer, do what you can if anything to remove any stickiness. Re-prime with a primer made specifically for vinyl or plastic, such as Chromatic vinyl primer #5004 made by Spraylat sign coatings. Contact your local sign shop, they can buy it from there sign supplier and sell it to you. Once that primer is on you can use just about any paint you want for a top coat.
Later - Derek
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Operation "SAVE RUDY" Strike Team (Associate Member)
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