Opened my tube of adhesive the other night and it was all gunked up so exchanged it for a new tube and hopefully it will work. My question is, I keep seeing where people use spray adhesive. Is this repositionable?? Do I just keep spraying new on top of old?? Or do I have to wash it off between applications?? I'd love to switch to it but want to make sure I understand the EXACT name of the product and how to use it before I take the leap!