painting interior PP plastic textured parts

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bmxpegan411

hi guys,

I'm painting some interior parts for a 2002 Ford Think electric car. The parts are grey PP textured plastic. I washed them with dish liquid and water, and some Scuff Stuff on a grey pad, but I'm worried that I didn't really scuff down in every spot since they're so textured. Should I prep these differently, or hit them with adhesion promoter, epoxy as sealer and paint? I also saw a guy heat them with a torch, then wipe with IPA to get the mold release out...is this step necessary or should it be avoided?

Thanks for all the replies!
 
I'd definitely wipe with IPA based cleaner at least once & use ad pro just before paint.
Flame treatments can have their good & bad points for plastics. For that I wouldn't.
 
adpro is a must. i have been flame treating plastic for 15 years. works as well as adpro does. the key to remember when doing it is that its not about the heat. the tip of the flame just touches the plastic in a semi quick pass and stress relieves it allowing fillers and paint to stick to it. the problems arise when you cook the crap out of the plastic with the torch. a quick pass is all thats needed. it should not get hot.
 
yes in most cases i still flame treat if its a hard to stick to plastic. bumper covers included. 90% of the plastic i paint though is not hard to bond to. its abs, pvc, etc. no need to do anything special with those.
 
pp, pe tpo, teo. are common hard to bond to types, which is the greatest majority of any modern car bumpers. The instructions of some repair products , such as evercoat polyflex , call for flame treatment. Like Jim says , you're just lightly touching the surface with the flame. I recommended against it for most stuff only because the average person may have too much of a tendency to overheat the plastic, removing too much oils from the whole thickness of the material & making them brittle.
 
thanks for the replies! here's a picture of the texture I'll be dealing with...all of the interior is grey like this and it's going black. the thing I'm most concerned about is how deep the texture is. Does a scuff stuff/wash with a scotch brite scuff inside all of the texture enough for adhesion promoter and sealer to keep it sticking, or should I address it another way?
 

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pp tends to get fuzzy or scratched when you use an abrasive on it. for interior parts like that i would wash them down with a sodium hydroxide base cleaner like zep purple industrial degreaser or westleys bleach white. blow the parts dry then do your adpro then spray black base with 10% activator in it and its done. no clear or anything is usually needed.
 
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