Plastic primer

1. kylesax L-plater Joined: Aug 2004 Posts: 65

   #1 19th April 2005, 02:18

   Hi,
   is it necessary to use a primer on plastic? I am asking regarding my dimma spoiler as my spray can plastic primer is rubbish for the large area of the spoiler.
   
   I have also had a BIG problem with paint seperating on the top side of the spoiler, i think it may be silicone or something engrained on the surface. It is not grease as it was prepared properly (thinners etc). I have rubbed it down now thoroughly and will try again. Any 1 else had this problem?
2. al_VTR East Anglia Joined: Sep 2004 Essex Posts: 6513 (broken) mk1 Saxo VTR, MG ZS, BMW 3 Series

   #2 19th April 2005, 02:25

   you will definitely need primer on plastics. rub it down first then apply.
   
   if you've already rubbed it down & used a degreaser then not sure what it could be. i'd be tempted to take something as big as a spoiler to a local place to spray for me.
3. user_3656 Saxperience Addict Joined: Aug 2004 Herts. N/W London Posts: 13578 Project MK4 MoreDoor

   #3 19th April 2005, 02:28

   mine was fine for spraying (when bodyshop fitted it)
   Yes I would use plastic primer though. Dont worry about the can being crap, as its only undercoat. Can sand it down in between coats anyway.
   Normal primer will just flake/peel over time.
4. al_VTR East Anglia Joined: Sep 2004 Essex Posts: 6513 (broken) mk1 Saxo VTR, MG ZS, BMW 3 Series

   #4 19th April 2005, 02:56

   any ideas why it may be seperating Alex ?
5. user_3656 Saxperience Addict Joined: Aug 2004 Herts. N/W London Posts: 13578 Project MK4 MoreDoor

   #5 19th April 2005, 04:04

   if plastic primer wasnt used, then thats the problem.
   Only other thing I can think of , is make sure there is no water/silicone or the like in the little Dimma badge that is on the top half of the spoiler as this is not good under paint.
6. kylesax L-plater Joined: Aug 2004 Posts: 65

   #6 19th April 2005, 22:09

   yeah plastic primer was used but the only plastic specific pimer i can find comes in a spray can and its rubbish. doesnt produce a proper fan to spray with.
   
   Just phoned a local garage and they said they would use a general high build primer, not a plastic specific one. Think i may give this a try.
7. al_VTR East Anglia Joined: Sep 2004 Essex Posts: 6513 (broken) mk1 Saxo VTR, MG ZS, BMW 3 Series

   #7 20th April 2005, 01:02

   cool. let us know how you get on mate. main thing is you gave it a whirl yourself.