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Thousands of pin holes3/23
I'm having trouble trying to get the paint I'm using to spray properly, or at least flow out to a smooth finish. I've never used this companies product before, and I've heard directly from my gun/pump manufacturer that people have had success using this paint with their spray systems. Whenever I spray I get thousands of pin holes all over, and it never flows out. This isn't a problem of dry spray where I'm not getting enough paint on there to flow. I've tried all kinds of different atomizing air pressures, and fluid pressures with no success. I've even purchased a seal kit for my gun and rebuilt it and it didn't help anything. I'm using a Kremlin 10.14 pump with a Kremlin MVX gun, and a water based paint. the spray shape is good and even, but then around the perimeter of the pattern its all peppery. Any Ideas?
I cannot tell much from your picture. But waterborne is very susceptible to micro bubbles. They in turn seem to cause a lot of issues, pinholes seem to be one I have seen a lot of since I switched to AAA.
I use a CA Tech AAA, with both the ML Campbell Agualente Waterborne products and the ValSpar Zenith Waterborne products.
My most successful setup with both finishes has been thinning with a retarder(35-40 with a #4 Ford Cup)Reducing the fluid pressure as low as I can( 20 psi at my pump) and a higher air pressure to the tip (20 -22 with a 409F tip) This setup seems to atomize the best and the retarder slows the drying to allow the bubbles to pop and close up before drying. Using water to thin didn't help me.
I still struggle with it every day. That's the problem with Waterborne. I have sprayed it for years, but used a CA Tech CPR gun with PPS. Atomizing was much better, didn't clog near as much and had a lot fewer issues. But AAA gives me the volume I need.
Holding the gun father away from the work piece then I did the CPR gun is a help also.
I had the same issue with several different products with waterbornes and kremlin setups..... It helps to add the Glycol retarders to really slow off the flash off time..... those dang pin holes go all the way to the bottom of the coating too... Pain in the rear. Best bet is to slow the coating... reduce fluid pressure... raise air atomizing pressure.... shoot piece further away than with a solvent coating and make sure your using tips with the pre-atomizing orfice aka fine finish tips. and also watch your wet film thickness.....not too much
What kind of material are you spraying? Are you spraying in a booth with the same airflow and temperature all the time? How thick is your wet film?