Will the paint crack on my plastic parts

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Will the paint crack on my plastic parts

Post by DroppedGrandAm on June 4th 2008, 10:42 am

Hey guys i was wondering what i should do considering that there is no flex additive in rustoleum. My whole car has plastic all over it the trim the bumper covers and the side skirts. Should i leave the plastic parts on the car while i paint them or take them off. I was worried about painting them while they are off the car because i was afraid that the paint might crack while putting them back on. What do you guys think has anyone on here had problems with lots of plastic parts. Or is this something i really don't need to worry about. Do you think it would crack or no. Thanks and sorry for all the questions.
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Re: Will the paint crack on my plastic parts

Post by tbirdsps on December 7th 2009, 6:48 pm

I have the same question and it appears there's nobody answering.

Anybody? How do you deal with this issue?
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Re: Will the paint crack on my plastic parts

Post by 63Falconconvert on December 8th 2009, 2:37 pm

I wouldn't worry about it and I say this because Rustoleum has the same characteristics as enamel. When I was shooting a lot of enamel back 20 plus years ago I never added a flex additive and I never had a problem. Lacquer was a different story, a flex additive had to be added. The term back then was "lacquer was a cracker". If you're using a lacquer base primer then you may have issues with your top coat cracking and flaking.
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Re: Will the paint crack on my plastic parts

Post by tbirdsps on December 8th 2009, 2:42 pm

That's good to know. I was concerned about it. This spring I hope to be painting my 86 Tbird. Red on top. Black on the bottom.
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Re: Will the paint crack on my plastic parts

Post by RoboGeek on December 8th 2009, 5:41 pm

worst cars to paint ever were the 60's cars with nitrocellulose lacquer paint. The hoods and other parts would 'craze' - looked like a dry lake bed. Sanding all that off was worse than fixing clear coat failures on todays cars!

That was usually caused by heating and cooling of the engine, but I had cars covered with it (66 buick wildcat for one)
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Re: Will the paint crack on my plastic parts

Post by retired plumber on December 8th 2009, 7:29 pm

I've painted two plastic bumpers (color change) and the guy at the paint store told me it wasen't necessary because it evaporates out in 6 months.
One I did on the car and the other needed work on it so it was done off the car. I was careful when I put it on but it did get twisted around some but no problem. they both lasted a long time, one I sold a year later and the other I donated three years later and they were still fine. Bottem line is.......I wouldn't worry about it.
Mike
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Re: Will the paint crack on my plastic parts

Post by tbirdsps on December 8th 2009, 7:36 pm

retired plumber wrote:I've painted two plastic bumpers (color change) and the guy at the paint store told me it wasen't necessary because it evaporates out in 6 months.
One I did on the car and the other needed work on it so it was done off the car. I was careful when I put it on but it did get twisted around some but no problem. they both lasted a long time, one I sold a year later and the other I donated three years later and they were still fine. Bottem line is.......I wouldn't worry about it.
Mike

Thanks for the info. I want my car to look like this when it's done. The red will be on top and the black on the bottom.


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Re: Will the paint crack on my plastic parts

Post by RoboGeek on December 8th 2009, 9:12 pm

that should look nice
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