spray painting plastic

Reply

  #1  
Old 09-14-14, 09:54 PM
Member
Thread Starter
Join Date: Sep 2014
Posts: 2
spray painting plastic

I dont think my long-explanation post went through, so in case it didnt, here's the deal. I am custom painting a Little Tikes car for my nephew, and cant seem to lay down a base-coat of gloss black without getting hundreds of little "pinholes" of imperfection with even the first coat of paint. Ive tried many many different prep methods, including filler-primer, and they just keep popping up. Ive tried different paints and various stages of sanding, and these little rackin frackin imperfections keep showing up before the paint has even dried to the touch. Help please!
 
Sponsored Links
  #2  
Old 09-15-14, 04:22 AM
GregH's Avatar
Super Moderator
Join Date: Jan 2001
Location: Manitoba
Posts: 9,627
Thumbs up Welcome to our forums!

Pinholes in paint is a form of fisheye and is normally caused by silicone or oil on the surface.
If the surface has been degreased there may be a reaction with the paint type you are using.

Some types of plastics can not be painted where the paint will last for any appreciable time but you can try spray in a rattle can labelled for plastics.
Follow the instruction for surface prep on the can.
 
  #3  
Old 09-15-14, 04:25 AM
Forum Topic Moderator
Join Date: Mar 2005
Location: USA
Posts: 43,004
I agree it sounds like fish eyes. They sell fish eye medicine you can add to the paint but I agree with Greg that plastics don't always paint well. I'd be inclined to sand/clean the plastic and use a rattle can of paint formulated for use over plastic.
 
  #4  
Old 09-18-14, 07:57 AM
Join Date: Sep 2014
Location: USA
Posts: 4
I agree with GregH and Marksr. Some plastic just doesn't take to certain paints very well. Depending on how you prime it afterwards, sanding might not be a bad idea. Thoughts?
 
  #5  
Old 09-23-14, 07:24 PM
Member
Thread Starter
Join Date: Sep 2014
Posts: 2
Thank you gentlemen for your advice. I've tried both regular spray paint and spray paint designed for plastics. Both leave pinholes. Would it be unwise to wipe the filler primer with some rubbing alcohol before laying down the first coat of paint? Or maybe even laying down the first coat, hitting it with the alcohol after it dries, and then doing a second coat? Thats the only thing I havent tried yet.
 
  #6  
Old 09-24-14, 03:12 AM
Forum Topic Moderator
Join Date: Mar 2005
Location: USA
Posts: 43,004
Denatured alcohol might help, never tried rubbing alcohol. You need to make sure any previous fish eyes or defects are sanded off, then wipe the plastic down with a clean lint free rag wet with solvent.
 
  #7  
Old 09-24-14, 05:39 AM
GregH's Avatar
Super Moderator
Join Date: Jan 2001
Location: Manitoba
Posts: 9,627
Not sure how much effort you want to expend to do this but you can try an adhesion promoter primer , a plastic primer or flexible bumper paint.

I am sure one of these would work.
 
Reply


Thread Tools
Search this Thread
Display Modes
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -7. The time now is 02:51 AM.