You will want to be careful with some of these home brews because they can damage film type coverings and even paint finishes. I am using a 50/50 mix of kerosene and mineral oil, which I get at my local tractor supply store. kero is $4 gal and the mineral is $18 so for $22 I get 2 gal of oil and my 20cc engine will use 12 oz in about 45 sec of continues smoke. I found that if your volume is turned up to high you will cool the muffler off too much and waste alot and get less smoke.I was atan event this fall with full scale planes and one of the pilots asked what I was using because I smoked better than his full size. Lots of choices this is just one, but it smells alot less than some others like diesel, and wont hurt the finish like form oil and brake fluid. I also use a separate lipo 1500 mah 7.2v and my pump is Sonic Tronics Good luck and have fun with it.