Will, if you have a pipe and you spray diesel in it, it may stick the walls of the pipe and it will smell badly! If you have the engine mounted at the tail you will be ok. Spraying a lot of smoke sometimes causes it to ignite. So, increase the smoke volume gradually till you get ignition then back it off...This is at full throttle. We use dry smoke here in the US from tower hobbies and it is very clean, smokes great and smell free....keep the smoke pump away from radio stuff. Good luck!!