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Car Forum / Mercedes-Benz Cars / April 2005

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HOW TO PAINT PLASTIC

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r parris - 13 Mar 2005 17:48 GMT
I am replacing the plastic "grill insert"  on my 190E due to a minor
accident.   I want it to be flat black,  to contrast with black
exterior.   Bought new insert, and scrubbed it with simple green and
toothbrush  air dried it, and sprayed on      2 coats of grey primer.
the next day I  sprayed on 2 coats of flat black.     Trying to add
accent strips, I found areas where the paint chipped off, or could be
scrapped off with my fingernail.  Was my preparation wrong, or is the
paint I used wrong?   (don't tell me I have to hand sand all 160 egg
crate openings)               paint is "fast drying auto paint" Thanks
for any advice......Rick  
Martin Joseph - 13 Mar 2005 20:04 GMT
> I am replacing the plastic "grill insert"  on my 190E due to a minor
> accident.   I want it to be flat black,  to contrast with black
[quoted text clipped - 6 lines]
> crate openings)               paint is "fast drying auto paint" Thanks
> for any advice......Rick

I would use testors plastic model paint instead of regular auto paint.

Did the primer peel off of the plastic? Or the paint off the primer?

Marty
Richard Sexton - 14 Mar 2005 01:18 GMT
>> I am replacing the plastic "grill insert"  on my 190E due to a minor
>> accident.   I want it to be flat black,  to contrast with black
[quoted text clipped - 8 lines]
>
>I would use testors plastic model paint instead of regular auto paint.

There's paint made for plastic. Any good hardware store will
have it in spray cans.

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r parris - 14 Mar 2005 03:43 GMT
Looks like the primer, and the paint can be scraped off  with my
fingernail on sharp edges.    The flat black paint never penetrated, or
bonded with the plastic, or the primer.......    This time I'll go to an
auto Paint store ...Etching primer and Krylon plastic paint...........I
can spray over this I think.... Thanks I'll try again.......Rick
Martin Joseph - 14 Mar 2005 09:14 GMT
> Looks like the primer, and the paint can be scraped off  with my
> fingernail on sharp edges.    The flat black paint never penetrated, or
> bonded with the plastic, or the primer.......    This time I'll go to an
> auto Paint store ...Etching primer and Krylon plastic paint...........I
> can spray over this I think.... Thanks I'll try again.......Rick

If the primer isn't sticking, you have made a big mess for yourself.  
You are probably going to need to get all the nonsticking material off,
or nothing you paint over it will hold.

Then again,  urethanes are very strong...

Good Luck,
Marty
brian clode - 13 Mar 2005 21:05 GMT
try an etching primer to key the plastic.
Brian

> I am replacing the plastic "grill insert"  on my 190E due to a minor
> accident.   I want it to be flat black,  to contrast with black
[quoted text clipped - 6 lines]
> crate openings)               paint is "fast drying auto paint" Thanks
> for any advice......Rick
Herb Greene - 13 Mar 2005 23:39 GMT
>I am replacing the plastic "grill insert"  on my 190E due to a minor
>accident.   I want it to be flat black,  to contrast with black
[quoted text clipped - 6 lines]
>crate openings)               paint is "fast drying auto paint" Thanks
>for any advice......Rick  
Krylon does have a paint specifically for plastic...don't know if they
have the color you need, though.
MTI - 15 Mar 2005 19:59 GMT
If you're respraying the grill insert, use "bumper paint" which has a flex
additive to make the part more resistant to chipping and cracking, either
from flexing or debris hits.
Paul Hyndman - 18 Mar 2005 23:04 GMT
Krylon Fusion ? for plastic.  Not available in flat black, but Satin Black
2421 should be okay:

http://www.krylon.com/main/product_template.cfm?levelid=5&sub_levelid=10&product
id=1751&content=product_details


Prepare the surface as recommended on the label. You may need to clean off
whatever primer etc you've already applied. I recollect seeing Fusion in
some of the larger Wal-Mart's.

Paul

--- http://www.astro-nut.com ---

in message news:24708-42346ECC-17@storefull-3117.bay.webtv.net...
>I am replacing the plastic "grill insert"  on my 190E due to a minor
> accident.   I want it to be flat black,  to contrast with black
[quoted text clipped - 6 lines]
> crate openings)               paint is "fast drying auto paint" Thanks
> for any advice......Rick
Peter - 26 Apr 2005 00:01 GMT
You must use special "plastic Primer" and the paint won't come off.

>I am replacing the plastic "grill insert"  on my 190E due to a minor
> accident.   I want it to be flat black,  to contrast with black
[quoted text clipped - 6 lines]
> crate openings)               paint is "fast drying auto paint" Thanks
> for any advice......Rick
dougmcp@gmail.com - 28 Apr 2005 15:31 GMT
You should have cleaned the plastic mold release agent off the grille
first. Simple Green won't cut it. Methinks a complete stripping is in
order before you repaint, otherwise that grille will continue to chip.

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