I'm using spray gun with automatic reciprocator system to coloring stainless steel sheet with some translucent lacquer. However, I found the color is unevenly sprayed and can't figure why is it uneven.
I've tried several ways including:
1.Different distance between spray gun and the steel sheet.
2.Different angle of the spray gun.
3.Moving speed of the spray gun.
4.Spray times and spray volume.
5.Air pressure of the spray gun.
6.Pressure of the lacquer.
7.Different temp and humidity.(64F~85F, 3X%~7X%)
8.Different spray gun.(Iwata LPA-200 and other locally manufactured spray gun.)
9.Cleaning the gun.
It looks like blushing but I think it's not blushing because the following reason:
1. Situation gets better when I tune the air pressure higher while it is believed to be worse if it's blushing.
2.I also tried different temp and humidity.(64F~85F, 3X%~7X%)
3.I've tried to heat up the steel sheet to about 85F-90F before spray but still in vain.
Is there anybody know the reason?
- I've cleaned it with Acetone before painting.
- For the plate surface, I'm using hairline or "fine bead blasting" plate, not mirror(No.8) plate.