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You have to prep the plastic the correct way to get paint to work. Atv plastic is very oily, matter of fact the first time I shot paint on atv plastic it was like I never even cleaned it. It was instantly full of fish eyes and runs. It was like the plastic repelled the paint like rainx does to water on a window. Since I have painted many atvs and gotten it to work quite well.
First off clean and sand the plastic. SAND ALL OF IT. Bottom, top, corners and edges. Once the plastics are sanded and clean apply an adhesion promoter that states it is for use on polypropylene. Ive used mostly Transtar 1034 and have not had any problems. This stuff bonds into the plastic and creates a layer ready to prime and paint. Also, I prefer a polyurethane single stage paint. Base clear gets too hard is more prone to cracking of the clear coat. It also seems to be more work than its worth for a trail atv. If your building a dune machine them maybe the base clear would be better.
DONT bother rattle canning your atv. These paints are too soft at first then too hard with age. You may make it look decent for the time being but you just setting yourself up for hours upon hours of stripping and sanding, and in the end you WILL regret it.
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