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I will second the Evercoat Rage Xtreme. I've been using it for quite awhile and recently made the mistake of trying a different product. Xtreme sands REALLY nice and is great to work with. Certainly if you have pinholes or scratches that you just can't get out without ruining the fill job, use a finishing putty over top, to skim coat where needed. Upol makes a finish putty called Dolphin that remains very flexible and is great for flexible surfaces as well. Evercoat Quantum series finish putty is nice stuff too. Not sure if they still make it, though.
I've admittedly never tried the Xtreme over plastic, but I'm guessing it will perform.
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