Painting over PP

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  • Dag Martinsson
    September 4, 2012 at 12:26 am #38167

    Howdy,

    I got 3 ATV’s to repaint, now I found out that the fenders are made of PP and both ppg and Sikkens AP that I can get here is not suitable for PP. Any suggestions, would Epoxy work?

    Dag

    Nelson Hays
    September 5, 2012 at 10:25 am #38182

    it SUCKS..

    The only way I have had consistent results is to get a really good tooth on it – 180 grit – then some REALLY thorough cleaning with solvent based plastic cleaner. Spray some adhesion promoter according to the directions, then shoot some epoxy to seal it up. DO NOT sand through the primer. You should be able to have those deep scratches close to leveled out, but some HB primer to finish it off.

    I have had good results with less prep, but I have had some cataclysmic failures as well.

    Dag Martinsson
    September 5, 2012 at 1:47 pm #38183

    Thanks, the PPG rep answered that it’s more or less impossible also He suggested as you to degrease very well and then just use DP40. What AP did you use?
    Dag

    don prcotor
    September 6, 2012 at 5:47 am #38207

    you can try ppg plastic prep system. it consist of a special sponge/scuff pad with cleaner solution, a cleaner wipe,(must wipe in one direction) and then followed by the plastic adheshion promoter. wait 15 mins. apply either sealer or dp reduced down to a sealer, then paint. but what ever you do don’t warranty. i mean these things are made to go thru hell and back. so i would make that clear to the owners. reguardless of what you use.

    Dag Martinsson
    September 6, 2012 at 6:49 pm #38216

    Well I made a small test, degrease, sanded with 320 degrease again then DP40 as sealer then SS.
    It dried overnight then out in the sun today. Then when I came back I put some 2″ masking tape over and pulled. No problem at all.

    Nelson Hays
    September 7, 2012 at 8:54 am #38226

    the way I test adhesion is flex the plastic. Those parts you’re going to spray are not unlike a lot of the interior stuff I do. small, flexible junk. they are going to flex when he’s riding, and then, if it’s not PERFECT adhesion, they will crack and spider and chunks will fall off.

    Dag Martinsson
    September 7, 2012 at 1:02 pm #38227

    we did flex the plastic a bit also. I will paint one to start with and then we see how it works.

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