Can you powdercoat over anodizing?

[UnorthodoxCreations Amateur Metal Finisher Find all posts View Profile Close UnorthodoxCreations]

I got a pair of brake calipers that a customer wants powdercoated but they are anodized silver. Can I coat over it or does it need to be removed? I searched and found I can use oven cleaner or Caswells stripper but is that neccessart? Just wondering.

[pickleboy Metal Finishing Guru Find all posts View Profile Close pickleboy]

Re: Can you powdercoat over anodizing?

the biggest problem i can think of is anodizing works as an insulator, meaning it is not conductive. that being the case you still may be able to pc them as long as you preheat the parts and shoot hot. i would wait and se if sswee answers back as he does both ano and pc so maybe he has tried what you ask.

[sswee Metal Finishing Guru Find all posts View Profile Close sswee]

Re: Can you powdercoat over anodizing?

That's something I have thought about but haven't tried yet. Since some anodizing is used as a pretreatment for painting to give corrosion protection and a good tooth for the paint to hold onto, it would seem to be a good idea. The possible problems would be the electrical issue with powdering, contaminates from the pores of the anodize coming out under heat on a used part, and no idea what would happen in an out gas situation with the anodize coating. I can't give a definite answer one way or the other. Sorry. My first inclination would be to strip them.
SS

[kchotboat Amateur Metal Finisher Find all posts View Profile Close kchotboat]

Re: Can you powdercoat over anodizing?

You need to strip it. I did a few of my boat parts that where anodized and it started coming off 6 months later.

[kchotboat Amateur Metal Finisher Find all posts View Profile Close kchotboat]

Re: Can you powdercoat over anodizing?

That's something I have thought about but haven't tried yet. Since some anodizing is used as a pretreatment for painting to give corrosion protection and a good tooth for the paint to hold onto, it would seem to be a good idea. The possible problems would be the electrical issue with powdering, contaminates from the pores of the anodize coming out under heat on a used part, and no idea what would happen in an out gas situation with the anodize coating. I can't give a definite answer one way or the other. Sorry. My first inclination would be to strip them.
SS

I know alot of custom boat paint shops that have metal parts powder coated to use as a primer/base coat.

[jtagger19 Experienced Metal Finisher Find all posts View Profile Close jtagger19]

Re: Can you powdercoat over anodizing?

anodizing it's not big problem
I sandblast it and comes off easy
then prep an coat as normal

[UnorthodoxCreations Amateur Metal Finisher Find all posts View Profile Close UnorthodoxCreations]

Re: Can you powdercoat over anodizing?

Sounds good, I'll strip them. Not worth the chance of having them flake off or something in a couple months.

Thanks
Adam

[mtnbiker Amateur Metal Finisher Find all posts View Profile Close mtnbiker]

Re: Can you powdercoat over anodizing?

anodizing it's not big problem
I sandblast it and comes off easy
then prep an coat as normal

Same here.