I've never shaved a tailgate handle, but I used to have a 1987 Cutlass and I shaved all the door lock and trunk lock holes. I actually used aluminum sheet metal and JB weld. After the JB weld fully cured for a day or two, my lil brother went over it with bondo, and blocked it out more times than I can count. I had the car painted in 1999 and I had the car until 2006 (I only sold it because it was flooded in Katrina and had too much rust). And all those years it never cracked or anything, you could not tell at all where the lock hole used to be. I had body shop guy look surprised as hell when I said how I shaved the locks, one guy thought I was lying, he was swearing it should have cracked using JB weld.