One for MB , Vics vapour rub

[Straight Shooter]

Looking on Youtube the other week and came across Dieseling ....now i have two air rifles .22 .....in the video this guy used Vics vapour rub as a propellant .....taking some vics and smearing some on the skirt of the pellet .....the results were remarkable increased velocity and showed more penetration to a metal target ...in fact the slug went right through the target, however he stated prolonged use could do damage to your spring and seals , but would there be a case for this method for the prepper ? my guns are spring and gas......now i know MB has the real deal along with proper bullets ......so what is the score using this method....any good for us boy scouts over here......and would we be within the law....heaven forbid breaking the law....golly that would not do at all!.....anyone know anything ?