, I have put countless timing tapes on my 390, well maybe 3, lol, they'll stay on till approx 3500- 4000 rpm than they pull loose and the timing pointer destroys them, I've carefully installed them removing All the paint and cleaning the bare metal with lacquer cleaner, I've contacted jeggs and they have replaced them no charge, I'm to try 1 more and I'm going to take Chris advice and spray a coat of clear paint over it.