That isn't like the setting tape I've used. What I have doesn't have any sticky side and isn't that difficult to use if you know how. However, here is a very old trick for applying anything with a self-adhesive backing that you need to move, align, etc...I learned this over 60 years ago. Use saliva if the adhesive piece is small. Just lick the sticky side liberally. Your spit will de-activate the adhesive until it dries. If you have a large piece, use dish soap diluted with water until you mimic the consistency of spit or close to it. Works the same way. Once it dries, it is stuck for good. Sort of like the old gelatin decals.
I'm not a fan of the RTV stuff, but that's just me. I've seen too much of that stuff go all funky after a few years in the Texas sun...
