Powder Paint Question

[psilvers]

I recently painted some jigs with a base coat of white - Columbia powder - TGIC formulation. I then tried to put a second coat of orange or yellow using CSI powder. At first they looked fine, but after curing, the jigs have white spots on them and they look like crap. Is it because I didn't put enough of the colored powder on the jig, or is it because there is some incompatility between Columbia and CSI formulations?

BTW, this was done using a fluid bed and a heat gun - no powder water or other additive is involved.

Thanks,

Pete

[atijigs]

I recently painted some jigs with a base coat of white - Columbia powder - TGIC formulation. I then tried to put a second coat of orange or yellow using CSI powder. At first they looked fine, but after curing, the jigs have white spots on them and they look like crap. Is it because I didn't put enough of the colored powder on the jig, or is it because there is some incompatility between Columbia and CSI formulations?

BTW, this was done using a fluid bed and a heat gun - no powder water or other additive is involved.

Thanks,

Pete

Did you have any kind of drip on the head after curing?. My first guess would be too much white. Maybe followed by too little top color. White flows pretty easily and will carry the top color with gravity upon curing. Unless glow paints you really don't need a base coat. IMO

[psilvers]

Did you have any kind of drip on the head after curing?. My first guess would be too much white. Maybe followed by too little top color. White flows pretty easily and will carry the top color with gravity upon curing. Unless glow paints you really don't need a base coat. IMO

That was my thought - too little of the color and a bit too much white. I find that when using fluorescent colors a base of white helps bring out the color.

Thanks,

Pete

BTW, no drips. I was worried about drips, so I probably used too little of the orange or yellow.

[psv]

I recently painted some jigs with a base coat of white - Columbia powder - TGIC formulation. I then tried to put a second coat of orange or yellow using CSI powder. At first they looked fine, but after curing, the jigs have white spots on them and they look like crap. Is it because I didn't put enough of the colored powder on the jig, or is it because there is some incompatility between Columbia and CSI formulations?

BTW, this was done using a fluid bed and a heat gun - no powder water or other additive is involved.

Thanks,

Pete

Pete,

it's definitely not compatibility issue. I mix both companies powders (including mirror white from Columbia) all of the time. I'd try to lover the oven temperature and increase curing time for couple minutes more and see how it'll work.

[psilvers]

Thanks PSV. You might be right on the oven temp. I had been running it at 375 (reading on an oven thermometer inside my convection toaster oven). I turned it on at supposedly the same setting and the thermometer inside was reading 450! I am letting it cool and trying to start over. Maybe time for a new oven.

Pete

quote name='psv' timestamp='1304899285' post='166431']

Pete,

it's definitely not compatibility issue. I mix both companies powders (including mirror white from Columbia) all of the time. I'd try to lover the oven temperature and increase curing time for couple minutes more and see how it'll work.