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Conversion varnish sheen7/10
I am experiencing uneven sheen with Axalta conversion varnish on dark colors. I recently did a clear matte finish on a set of black cabinets and a clear satin on a dark brown stain. I am using a Graco AAA gun and pump. My sheen looks splotchy. I am careful about getting a wet even coat. I then retarded the finish thinking it was drying too fast. When that didn't work I changed the pump pressure and air pressure at about 8 different settings with zero difference in the splotchy sheen. I then grabbed an old $90 pressure pot gun setup and it sprayed great. What is it with the atomization on the AAA that is causing this on both the matte and satin topcoat?
I don't have much advice since I don't use that product and I have a Kremlin for an AAA pump. But I'll take a stab.
How shook up is the finish before you start to apply it. Is it just a good stir? Because that might not be enough.
If the HVLP is working then it's more to do with atomization air. Maybe crank the air up on the pump and leave the liquid pressure where you normally have it. I have a product that I spray that they tell me to do that to break it up better so it lays out nicer.
Stripes are can also occur when you have the gun to close to the substrate. Maybe back off the gun distance. Or get a nozzle that has a wider fan.
I hear that type gun warms the product,
AAA can put out a lot of material very quickly. How many wet mils are you putting on per coat, and how long did you wait before recoating? You could be seeing solvent entrapment. Too heavy of a coat is likely your problem. In some cases solvent from the first coat can even gas off and cause micro-bubbles in the second coat if the recoat time is too short for the speed of the solvent being used. You will usually not even notice the hazy effect on lighter color woods, but it becomes very obvious on dark woods.
Hope this helps. RonB
Thanks for your thoughts. We let it dry overnight so I don't think solvent entrapment is the case. We have also adjusted pressures around and didn't get a change in results. We put on about 3 wet mil. We are waiting to hear back from our rep about whether or not a kremlin AAA is doing the same thing with this finish. We have been using this finish for quite some time, but the Graco AAA is new in the last couple years and haven't done much for matte sheens.