USE PLENTY OF CUTTING FLUID AND TAKE YOUR TIME! I can't stress that enough. You can catch and filter your cutting fluid and recirculate it so you aren't going through so much of it, if you take your time and don't force it and use plenty of cutting fluid it works. I used this for running black iron LPG piping. Used gas approved Teflon tape and also gas approved pipe dope and not had any leaks. Threads were smooth without any issues. Two turns in and two turns back then continue forward again. It's not like the commercial thread cutters so do understand that this is for lighter use but it does work and it works well and like everything else keep it clean and maintained!
JSC 
