Mirror gloss black+Midnight clear

[peter61]

I'm doing some quad rims with columbia's Super mirror gloss black and columbia's midnight clear flake,has anyone used these powders?I'm getting a few rough spots after the clear,could it be the flakes that are in the clear?

[SCOTTRODS]

Originally Posted by peter61

I'm doing some quad rims with columbia's Super mirror gloss black and columbia's midnight clear flake,has anyone used these powders?I'm getting a few rough spots after the clear,could it be the flakes that are in the clear?

Seems any "flake" powder will do that sometimes. The larger the flake, the more prominent the roughness. It seems to be, the powder is not "mixed" thoroughly. Some have recomended loading the powder in your gun and shaking it vigorously before shooting. It's also been said that larger flakes tend to stand on edge with a heavy static charge causing the roughness. I'm not sure either one of these is the real problem you're having but one of them could be I suppose.

Sounds like a nice coat if it works out.

Good luck

[peter61]

That makes perfect sense,although I did shake up the powder in the container,I didn't shake the gun,the results are really nice except for the rough areas,thanks for your input.

[Harleydad]

The roughness is most likely the result off unbonded metallic powders. Not having the flake thoroughly mixed will result in drowning (heavy flake in one area, minimal flake in others). Scottrods is correct about the flake not laying flat. Spraying at a lower kv will help with that. You could shoot another coat of a normal clear to smooth things out.

This explains bonded powders:
http://www.powdercoatingonline.com/h...d_Powders.html

[peter61]

Do I need to rough up the rims or can I just shoot another layer of plain clear?Thanks Scottrods and Harley dad.