Use rapid tac II and use high quality frosted vinyl, do the testing before you go to customer site. we have done several project and each project apply more than 24 windows, we have to go customer site twice, one for installation and one to remove the masking tape and fix. when remove the masking tape with water, it is unavoidable to have few small bubbles, we either peer off the vinyl partly, apply then heat the vinyl, the vinyl maybe stretched when you peer it off, but when use heat gun, it recovered and the glue is even as other part, we use mactac frost vinyl. not all the frosted vinyl can be heated, you have to test it before you go.