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With any of the stuff you use you want to go over it with a clear coat of some kind to get the best results. If you have access to a 2 part catalyzed clear it'll probably last many many years.
you are correct with the clear coat I did all mine the parts store i work at on weekend also mixes paint just mixed up some black candy and two part clear and did all mine headlights(extra light). I'll post a post some pics when my computer will let me upload them.