A: The spray gun is supplied with the three nozzle sizes you mention as part of the package. Should you buy the set before you use it dismantle the gun and check that all orifices are clean and clear. No matter how much experience you have read the instructions for gun set up, use and clean up, it can save some frustration.
A: I've never heard of air backing up into the cup. For clear lacquer I'm using a 1.5 mm tip and it works well. My mix ratio is 50% Acetone, 33% lacquer and 17% lacquer thinner. It goes on very smooth and there's enough lacquer to put on a nice coat. Some shoot 50% lacquer and 50% lacquer thinner. If you're shooting straight lacquer (or other clear) it might be too thick and causing the bubbling. Or, you have your liquid adjustment set for too much liquid to come out. Remove your needle and make sure it is smooth and clean of any clear. Make sure the nozzle holes are clean. Before putting the needle back in lightly coat it wih a fine oil. I use gun oil and it works well. If the needle is rough, first clean it and wipe it with a solvent. If it is rough, try lightly sanding it with a very fine grit sandpaper, like 1500. When you reinstall it and it doesn't go in easily, the packing nut might be too tight. It is the one right behind the nozzle and in line below the cup. The needle goes through it. Hand tighten until it's just snug and then back off 1-2 turns. If it starts leaking tighten it a little at a time until the leak stops. The needle goes through the nut and if it is too tight the needle won't move easily when the trigger is squeezed.
A: Unfortunately, kits cannot be customized.
A: Please contact Customer Service 866-409-4581
A: If the needles are bowed or bent they should be replaced. Nicks and scratches are not good. You might be able to smooth them out with extra fine sandpaper, somewhere in the neighborhood of 1500 grit. You don't want to add scratches by using too heavy of a sandpaper grit.
A: I don't know. If you're doing a large job like a deck, you probably need an HVLP gun which is High Volume Low Pressure. The LVLP (Low Volume Low Pressure) probably doesn't have the power for a large job, but you can try. Check with Thompson's for their recommendation.
A: Yes, it will spray urethane finishes. Thin urethane to manufacturers specs for spraying. Test spray to gauge best settings then go for it! Lay down a good first coat and recoat following manufacturers instructions. Make sure you have sufficient compressor power, a good cfm rate. Small compressors can struggle to keep the flow sufficient. This spray gun works very well for the price point and should be cleaned immediately after spraying is finished.
A: Yes it can, given that you are using the correct tip size and are spraying at the PSI recommended by the urethane manufacture. Make sure your compressor can supply the gun with the volume of air required while spraying at the recommended PSI. The kit has three tip sizes. If you buy the gun alone, you only get one 1.3 mm tip.
A: Thank you for the interest in the SPRAYIT SP-33000 LVLP Spray Gun. Yes, you can spray urethane with this spray gun. Please contact the coating manufacture for nozzle sizes and dilution if needed.
A: Yes, from the videos I've seen urethanes can be sprayed from this gun. But, if you've used other types of finishing chemicals in this spray gun, make sure to clean it very thoroughly. You don't want to mix paint types in the same gun without thoroughly cleaning it and getting out all of the previous liguids, even though they're probably dry. Also, is your urethane water- or oil- base? Many painters will have more than 1 spray gun to use for the different types of chemicals they will be spraying. This gun is not too expensive so financially it might be doable. Lacquer takes extra attention to clean from the gun, and even if you change to a urethane, you should still give a lot of attention to cleaning after EACH use.