Most people use RITT dye. Not all of the plastics will take it without mixing in salt and vinegar and other mixes. If you pull A search here on RCU there must be about 100 different threads on doing it. Depending on the colors I also dye my APC props to match the plane. Yellow is not one of the colors to try on your props. Ask me how I know that. [8D] I do know Red and Blue come out great.