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Old 10-13-2005, 05:58 PM
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Painting a plastic grille

I have a grille and headlight bezels that need re-finishing. The parts are GM and were originally a bright silver that has weathered over the years. What is the best way to prep and paint plastic parts? What would be the best products to use that would be close to original color?

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Old 11-02-2005, 08:25 AM
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krylon makes a primer for plastic and if you want original color gm makes trim paint that is the same color is factory im not shur were to get it but i know that they make it
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Old 11-02-2005, 08:37 AM
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Adhesion promotor

Mar-Hyde and House of Kolor have adhesion promotors..I am not sure on the "silver color" as some of those were done with a special factory finish..Some of the fellows use the adhesion promotor and then paint the plastic body color for example..

Check with your local paint jobber for these products..

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Old 11-02-2005, 09:37 PM
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Most of the old plastic grilles were made from ABS and don't require an adhesion promoter.
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Old 11-02-2005, 09:50 PM
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Thanks for the info!
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Old 11-03-2005, 09:13 AM
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We just painted the grill for our project car with regular automotive touch up paint. What a MISTAKE. The grill is toast now. Had to buy another one. The plastic code on the back says PC (polycarbonate) When we painted it the paint actually ate spider trails all through the plastic. The only thing that did not seem to affect the plastic was enamel.

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Old 11-03-2005, 08:15 PM
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i might be wrong, but that's called plastic chrome....there's a place in phoenix, i found him in hemmings...i sent my 65 falcon dash trim that was originally the same but over time became worn, gray and dull...

he "re-chromed" the plastic parts for me...i've tried numerous times to paint a chrome finish, it'll look great until you touch it, wipe it, breath on it or clear coat it, then it turns gray instantly

good luck....oh and autozone or any place that sells dupli-color spray bombs sells plastic & vinyl primer, which is just an adhesive promoter for paints
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Old 11-03-2005, 08:28 PM
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I'm guessing these are chevy truck items, the argent color I bet. And if so they should be made of ABS. Can't think of any GM cars with plastic headlight bezels-maybe I'm braindead?
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Old 11-04-2005, 05:54 AM
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Correct on all counts. The parts are off a full size Blazer.
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Old 11-05-2005, 01:49 PM
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Quote:
Originally Posted by blacklabzeke
Correct on all counts. The parts are off a full size Blazer.
I too have a k5, now converted to 3/4 ton. I painted the grill (1983) with "bulldog" adhesion promoter, then used krylon flat black. It really worked well and has seen it's share of abuse..
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Old 11-05-2005, 07:02 PM
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if its bare plastic and it is abs you dont want to spray your basecoat directly on it. the solvents from the reducer will really attack the abs. as bob said abs doesn't require adhesion promoter. sand the parts with 220, give them a coat of 2k primer. let set overnight, sand and base and clear as you would anything else. look on the back of the parts. you should see something like >pc< or >abs< . this is the plastic type. sometimes there are blends like >abs+pa6< which is nylon and abs. if its no there and you dont know what type of plastic it is take some sandpaper on the backside and sand the finish off in a spot. take some actone on a rag and wipe the spot. see if it shines like the acetone is melting into it. if it does prep it like i said above. if the acetone has no effect then to be safe sand the parts with 400 or red scotchbrite, spray an adhesion promoter on it, bulldog, etc. then you can either prime to take out defects or go right to basecoat.
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Old 11-05-2005, 07:34 PM
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Thanks Jim.
I was curious about this.
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Old 11-05-2005, 09:06 PM
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The grille is marked ABS on the back. Does anyone have a recomendation for the original (silver-gray) color?
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Old 11-05-2005, 09:13 PM
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not sure exactly what the color is. take it to your local jobber and try and match it to some color chips. if its a matte silver finish i would find a color that matches then have them mix it up in an acrylic urethane and have them add flattener to it to give it a matte finish.
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