Hi! I bought a very used but still sound longboard to customize but I'm completely stuck on removing the griptape. I tried everything and heated it with a blowdryer for a long time, but can't get my razor under the tape. At this point, I'm not even sure if it's tape on there or some kind of spray on that's not removeable. Is it possible to sand it off, or at least get the grit off, so I can put on some new grip tape? Thanks!