THose 3m's are primer guns only,we use them @ work,and thats all they're good for. To the painter,not to sound like a jerk,but spend the $$$$ and get yourself good guns if you want to charge for your work. Sata's are all I use,3000 1.3 rp sealer gun(my old clear gun),3000 hvlp 1.4 base gun,and 4000 BRP 1.3 clear gun,they aren't cheap,but they make a good painter an even better painter IMO. You will struggle with cheap guns,and that includes devillbiss,they are middle of the road @ best. Lastly,one gun will not do it all well,you need dedicated guns to get good results.