04-03-2012, 01:51 AM
The chemical blackener does improve the paint adhesion and is more resistant to being scuffed off the metal parts, too. 
I've used it on a few cars, but usually don't think of it until the car is already painted. 
It also doesn't work on stainless steel wire.
Wayne
I've used it on a few cars, but usually don't think of it until the car is already painted. It also doesn't work on stainless steel wire.Wayne