spotty second coat

[sawdust1]

I have a question about putting on a second layer.
I sandblasted aluminum, epoxy first layer, flowed it out. Second layer is polyester clear matt for UV protection. When I applied the second layer I kept getting thin spots like I was looking at a dalmation dog.
Any thoughts?
Not obvious after cooking.

David

[weldguy]

Not sure what would cause that but at least it flowed out and looked good in the end. If you find out let me know because I have had similar issues.

[conradestrada]

That is caused by a poor ground

[ccoatings]

Sounds like back ionization, I second the post about poor ground. How close is your ground rod?

[sawdust1]

No idea actually!

[jessienc]

back ionization from spraying with the gun to close, its charges little spots in the metal. i started holding the gun farther away and haven't had any issues since

[weldguy]

back ionization from spraying with the gun to close, its charges little spots in the metal. i started holding the gun farther away and haven't had any issues since

Thanks for the tip, I will give that a try

[adbuch]

back ionization from spraying with the gun to close, its charges little spots in the metal. i started holding the gun farther away and haven't had any issues since

[ccoatings]

The issue with BI and the gun being too close would be dependent on the equipment, and I would say that is would hold true for most low end or hobby controllers. For BI, you are most likely looking at a grounding issue on almost all cases. Check your resistance to ground, best with a megger, and go from there.