I've tried the MAPP gas, mini-acetylene torch sets, & even the big propane torch sets with little to no success. The only resonable way is still the big oxy/acety torch with a big heating tip IMO. We usually just bring the bluestone pieces that need flaming back to the shop on smaller jobs. I agree that it's no fun lugging a big torch set along with to the job, but it's a necessary "evil" sometimes I guess. BTW, I've noticed that any length of time spent "flaming" actually uses ALOT of gas, making the smaller torch sets a PITA. Good Luck.