I just started using bin primer and Campbell water born pigmented lacquer. I painted heavy equipment in the past using enamel and oil based paint. I am using the same cleaning procedure on my guns now as i did before. But now the gun is building up and is not staying clean. I have tried soaking them is water (for the campbell) and alcohol (for the BIN) without success. Any suggestions? I am using a cheap HVLP gun.
Household ammonia, even diluted, is great for stripping shellac (ask an old French polisher). Simple Green will remove multiple paint layers from metal hardware without disturbing the original plating or patina. Requires immersion at least overnight but then rinses clean without abrasion. Might work on guns & lines. Good luck.
I spray WB topcoats all the time with a cheap HVLP gun. I might leave the finish in the cup all day, but never over night. To clean it I just dump what's in the cup back into the can, remove the cap and soak it in warm water with some dish detergent while I'm cleaning the gun. I run warm water into the cup while holding the trigger open until it runs clear, then add a little dish detergent to the water and let that run through. Follow with a little clear water, then hook up the air line again and spray out any residual water. I scrub the air cap with a tooth brush if there's any finish built up on it and make sure the holes are all clean, then dry it. I've pulled the needle a couple of times and cleaned a little build up off when I noticed the water didn't squirt out straight during clean up. Never found anything inside the gun when I've disassembled it to inspect.
With BIN I do pretty much the same except with DNA.
Between spray sessions I wipe the air cap and end of the needle with water or DNA to clean off any buildup.
I've been using the gun for about 5 years now and it still sprays fine.
Ask your Campbell dealer for their 'waterborne gun and line cleaner'. Great product for solvent or waterborne finishes. Mix with water and let gun parts soak overnight. I use it all the time with cv. Takes off many months old cv with ease.
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