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Paint buildup on spray nozzle.3/20
Build up occurs on nozzle consistently where we have to clean the nozzle quite often. We spray precatalyzed lacquers clear and opaque. Use HVLP guns with spray pots. We've tried less air, material and fan and are still getting the above.
If your material flow and air pressure are suitable for the air-cap then build up on your air-cap is usually the result of either a dirty/clogged air passage in one of the horns of the air-cap or some solid gunk stuck in the nozzle giving you a angled stream out of the nozzle...give that baby a good cleaning and if that doesn't work then it sounds like time for new parts.
Thank you for the tip Nick, we will try it out.
the other thing that will cause that issue is spraying too close to the part and bounce back is laying on fluid tips, the other reason is that if you are soaking your air cAPS, whic you should not do, any obstruction in the air cap holes or ports that can turn the pattern to a different angle, sometimes you have to change out an go to a no smoke air cap that is available for binks guns, seriously their is a cap designed just for that very issue
also did it just start happening, look at the fluid tip and make sure it is concentric, if not that can be a cause
You mentioned "not" soaking your air caps.
After cleaning , I take the gun apart and clean and soak the needle, nozzle and air horn. I use a 50/50 lacquer/aceatone.
thanks for the very kind words, think of soaking your air cap like this
you place in a jar/can of solvent, over time the solvent breaks down any paint, or coating letting the sediment form on the bottom of the can, out of site out of mind, when you drop the air cap in, it is like stepping in mud in a creek, the bottom is disturbed, the problem with the air cap is that they are many holes which are small that small particles can land in and sometimes they are a pia to remove if at all, the extra big problems is teh horn of the air caps where it turns 90 degree, if you get a piece of sludge in their unless you have a ultrasonic cleaner, the air cap is toast and get ready to spend between 70-140 for a new one.
if the air cap is direct, hold it facing down, the horns facing down so the junk that you clean off falls down not back inside the aircap
thx for the kind words
also why take apart the gun, if its flushed and you leave it wet filled with solvent very rarely do you need to take it apart unless you are using a coating that has a very short pot lilfe, all you do is wear out the seals faster, always leave the gun full of solvent,
What type of HVLP gun are you spraying with, your fluid nozzle size, what is the fluid pressure set at going into the pot and your atomizing air setting to gun.
If material is collecting on your cap I would suspect your material is possibly too thick for your setup. Try reducing if a good cleaning doesn't fix you up...