Sorry Jeff, It's ONLY recomended for metal, aluminum, and wood. Personaly, I use SEM39863 plastic adhesion promoter. Followed by SEM39133(sands easy) flexable bumper primer surfacer. They work great with urethane top coats.
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1970 T1 W/MassIVe 2913cc RAT/?EFI? w/direct fire (very soon) and 915 trans
1962 SC 1776cc SP 944NA brakes, 993 wheels
VKG