 | Quote: |  | | |  | Originally Posted by swimsfast99 |  | | | | | | | | | it looks like u didnt use their adhesion promoter. Its a coat u put on top of the ground coat to allow the anondized paint to stick. I think it might be a little too picky for me so I will prob just try to do a nice bright red coat and make sure to have a nice finish on it | |  | |  | |
That could be, but if the cans didn't recommend it, I didn't do it. I followed the instructions printed on the can label to a "T". In fact, their own instructions are a bit befuddling.
The directions say a groundcoat is only needed for prepainted surfaces, and should not be required for bare metal, or bare sanded metal. The adhesion promoter is only required for chrome or very smooth surfaces. The computer chassis I tried this on was unpainted bare metal, which I'd scuffed up with 400-grit. So according to the directions, no groundcoat OR adhesion promoter should have been needed. Still, I applied the groundcoat just to be safe. The results weren't only limited to bad adhesion, either. The paint was runny and the spray came out of the can spitty (if that's a word, but should give you a good idea what I'm talking about) and inconsistently. It was the same with a can of blue and green Metalcast.
I pulled this from Duplicolor's "Metalcast Tips" on their site:
 | Quote: |  | | | | | | | | | | Q. When I spray the METALCAST™ do I need to apply the Adhesion Promoter?
A. Yes, Dupli-Color® Adhesion Promoter (CP199) is recommended when spraying over chrome. In addition, scuff the surface with a red scuff pad before applying the Adhesion Promoter. Allow 15 minutes for the Adhesion Promoter to dry before applying two coats of METALCAST™.
Q. Do I have to use the METALCAST™ Ground Coat on chrome or bare-metal surfaces?
A. No, METALCAST™ Color works best when applied with the CP-199 Adhesion Promoter directly over scuffed chrome-like or bare-metal surfaces. The METALCAST™ Groundcoat is recommended for pre-painted surfaces only. | |  | |  | |
So, the directions seem to be a little unclear, at best. I might have to try it again with adhesion promoter, just for kicks, and see what happens...even though it's not suggested for use on bare metal, only on smooth surfaces like chrome.