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How do you paint polypropylene?

grrl

grrl

Diamond Member
I googled this but came up with little other than Krylon Fusion supposedly works.

I want to paint the lids on a pair of Givi side bags. Yesterday I wasted a can of primer on them only to have it all flake off. Has anyone successfully painted these cases or other things make of PP?
 
Is Krylon Fusion the paint meant for plastics?

Yeah, that's the only thing I've heard of that might work...
 
Originally posted by: Sluggo
This stuff has stuck to about everything I have ever sprayed it on. Its a great product, maybe worth a shot.
Click to expand...

The problem is that the paint has to be flexible just like the piece being painted. On cars with plastic bumpers and whatnot they add a flex agent to the paint and that works pretty good. But on REALLY flexible things, you'll have trouble getting most any paint to stick.
 
Since Dow is the leading global supplier of polypropylene, you might check with an authorized Dow dealer and see what kind of paint they recommend.
 
Originally posted by: Jeff7181
Originally posted by: Sluggo
This stuff has stuck to about everything I have ever sprayed it on. Its a great product, maybe worth a shot.
Click to expand...

The problem is that the paint has to be flexible just like the piece being painted. On cars with plastic bumpers and whatnot they add a flex agent to the paint and that works pretty good. But on REALLY flexible things, you'll have trouble getting most any paint to stick.
Click to expand...


The lid is pretty rigid, so I'm not *too* worried about flex. Interesingly all the primer flaked off except for a small spot where I had lightly sanded the lid. The primer is stuck on that part. Maybe all I need to do is sand it first?

 
Originally posted by: grrl
Originally posted by: Jeff7181
Originally posted by: Sluggo
This stuff has stuck to about everything I have ever sprayed it on. Its a great product, maybe worth a shot.
Click to expand...

The problem is that the paint has to be flexible just like the piece being painted. On cars with plastic bumpers and whatnot they add a flex agent to the paint and that works pretty good. But on REALLY flexible things, you'll have trouble getting most any paint to stick.
Click to expand...


The lid is pretty rigid, so I'm not *too* worried about flex. Interesingly all the primer flaked off except for a small spot where I had lightly sanded the lid. The primer is stuck on that part. Maybe all I need to do is sand it first?
Click to expand...

Oh... yeah... sand it... I thought you said you did that... I guess not after reading it again. Yeah... scuff it up. Steel wool would even work I bet.
 
Some vinyl dye should do on most plastics. You can pick it up at any auto store in a variety of colors. The diffrence between the dye and the paint is that the dye will sink into the plastic rather then stay on the surface like paint.
 
Originally posted by: chiwawa626
Some vinyl dye should do on most plastics. You can pick it up at any auto store in a variety of colors. The diffrence between the dye and the paint is that the dye will sink into the plastic rather then stay on the surface like paint.
Click to expand...


I was considering dye, but I need a color that closely matches my bike. I know one place makes custom colors, but it may not be worth the cost. I'll have to try to find that link again.
 
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