Problems with reduced epoxy

[64chevmn]

I've sprayed about 2 gallons of unreduced epoxy over the past few months without any problems at all. I'm starting to spray my frame and suspension parts and I'm going for a semi-gloss look. I sprayed the first round of suspension parts with 2 wet coats of unreduced epoxy. I let them sit over night and sprayed them with one more wet coat with 25 percent reduced epoxy. I let the mixed activated epoxy induce for 30 minutes then added the SPI medium reducer; then let it sit for another 15 minutes before spraying.

About 30 minutes after spraying the parts, I noticed a a milky film or something similar to that on portions of the newly primed parts. Most of it goes away after 24 hours, but am I doing something wrong? The garage temp is at 70 degrees with less than 20 percent humidity. It almost seems like the reducer is not mixing well or flashing properly?

Dan

 

[Barry]

It is moisture plain and simple.
Causes;
Water in air line.
Lacquer thinner or acetone as a reducer.
Omni reducer, Nason or other lower grades usually used when I get this call.

If none of the above only solution, I know is let it induce longer, maybe over night and longer flash times.

 

[64chevmn]

I'm not using lacquer thinner or acetone, just the SPI reducer; so the water in the line sounds like my problem. I dont heat the portion of my shop that I use for painting when it is not in use and that is where my compressor is. I'm assuming my compressor water filter can't keep up with the moisture due to the constant 15 degrees to 70 degree temp changes in the shop when I decide to paint. I'll make sure my lines/filter are clear of any moisture and shoot some more parts this weekend.........THANKS Barry!

Dan

 

[Barry]

Spraying at night and in cold air will also cause this, as well as wetting the floor but usually not done for epoxy.
Longer induction should stop the blushing unless the lines are really putting out the moisture.