As there is no backing on any of our foam tapes, you can simply begin applying it inside the aperture. For example, when masking off the inside of the door or the jambs, you should open these and begin to apply the tape to either the body or the inside of the moving part, dependent on which foam tape you’re using. The door can be closed once you’ve pressed the adhesive down firmly. It’s also important to check that the foam is visible before painting to ensure that the surface is well-protected.