Any trick to spraying flat powder?

[4birdman]

This was the first time I've had to spray flat powder. I had just sprayed some gloss red and gloss black and they came out great. I had just bought some flat black and tried it on two lower legs off of a Harley. One of them had big clumps on it, not bubbles but clumps, that I must not have seen before curing it. The other one came out looking like dark grey, even though it had a really thick coat of powder on it.

I thought it might be a problem with the gun, so I cleaned it and tried again on a valley pan. It came out pretty good, but still had a greyish color to it, not a flat black like it should have been.

Did I just use crappy powder or is there some different way to do flats?

[Banditperformance]

Only flat black's I have used are caswells high heat velvet black, and the Black Cat Urethane. Both sprayed really well.

[4birdman]

This was the Caswell Solar Flat Black. It sprayed like ****, I even had to shake the gun pretty hard to make the stuff start spraying.

[nuttyman]

i've had some problems with a few of Caswell's powders before. They were completely clumped in the can & I had to spend a considerable amount of time preparing the powder to spray. oh & Caswell didn't do anything to rectify the situation either!