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Mon Jul 13, 2015 7:49 am

Good Morning,

After installing replacement panels, do most of you strip all the black primer off before priming/ painting or do you paint over it? I have spots that will be painted for protection that will never be seen; Will that primer react to paint?

Thanks,

Jon

Mon Jul 13, 2015 8:00 am

I stripped the black coating off my new fenders, apron and exhaust header/j-tubes/exhaust. The exhaust parts actually come with a note to remove the factory coating and apply high temp. paint.

Mon Jul 13, 2015 8:16 am

[quote="Jon's62"]Good Morning,

After installing replacement panels, do most of you strip all the black primer off before priming/ painting or do you paint over it? I have spots that will be painted for protection that will never be seen; Will that primer react to paint?

Thanks,

Jon[/quote

That black paint is used to prevent rust during shipping and because you don't know what they using it may not be compatible with what you are using as a top coat. We always take these parts down to bare metal then use a self etching primer that is known to work with all the other chemicals. Stay within a product line such as Omni. Omni is a lower line of PPG but still good quality.

Mon Jul 13, 2015 8:19 am

It was my guess that it had to be removed, now you've confirmed it. I appreciate the information!

Mon Jul 13, 2015 9:28 am

You can paint right over it. Just make sure you scuff or sand it first!

Mon Jul 13, 2015 9:32 am

I think I am going to use Wurth Stone guard, mostly on the underside of the new clip and my fenders.

Mon Jul 13, 2015 9:35 am

Just make sure you scuff it or sand it first! Paint is a "mechanical" bond, meaning it has to be sanded so the paint can "bite" into it to stick.
Show us pics when you get it done!

Mon Jul 13, 2015 10:00 am

Self etching primer that is compatible with your other products is best. Don't half ass or be prepared to do it over.

Mon Jul 13, 2015 10:02 am

Nothing wrong with being cautious, but according to I-Car, you should consult the manufacturor as to whether the coating itself can serve as a primer, however they say not to remove the coating completely, but to scuff sand and spray primer over the black coating.

https://books.google.ca/books?id=qvph5aFkrJgC&...mp;f=false

Mon Jul 13, 2015 12:22 pm

Scuff it first and prime it with new primer the black is just a protective coat for shiping and storage till you get to the new part not really a primer when i worked at the body shop and went to auto body and collisio . School we always scuffed and put new primer on them before we painted

Mon Jul 13, 2015 6:38 pm

63vbug82 wrote: Scuff it first and prime it with new primer the black is just a protective coat for shiping and storage till you get to the new part not really a primer when i worked at the body shop and went to auto body and collisio . School we always scuffed and put new primer on them before we painted

X2 I have a few hundred hours of training as well. One of the first things they taught us is take it bare metal and use all the chemicals you'll use including fillers and coatings will work as a system. Mixing different products and cutting corners can result in poor results. Anyone telling you to scuff an unknown product and shoot over that is talking out their ass. As the old saying goes " its all in the prep".

Mon Jul 13, 2015 11:32 pm

Zundfolge1432 wrote: 63vbug82 wrote: Scuff it first and prime it with new primer the black is just a protective coat for shiping and storage till you get to the new part not really a primer when i worked at the body shop and went to auto body and collisio . School we always scuffed and put new primer on them before we painted

X2 I have a few hundred hours of training as well. One of the first things they taught us is take it bare metal and use all the chemicals you'll use including fillers and coatings will work as a system. Mixing different products and cutting corners can result in poor results. Anyone telling you to scuff an unknown product and shoot over that is talking out their ass. As the old saying goes " its all in the prep".
We where doing quality work not the maco 500 doller crap or what ever it is they do lol

Tue Jul 14, 2015 2:55 am

take all that black crap off and work up from bare metal with a brand/system

Tue Jul 14, 2015 10:09 am

Depends on what the coating is. The common EDP coating makes for an excellent base. All you need to do is scuff it and epoxy prime over it. Check with your primer manufacturer, some primers work better with EDP coating than others.

-jeffrey