Hi Daniel give it a try on a old model or piece of plastic its so easy to do.
Hi Lucas your spot on and you can use vegemite as well (Iprefer marmite on my toast though). Re do's and donts dont think there are any, if you put on to muchit just wipes off with a wet cloth no residue,dont use enamels for the top coat it has to be acrylic or water base thats all I can think of