I've been told that there is a 3M windshield installation kit available for our cars. Is there a gasket type of material that goes on this, or is it just the glue/caulking type of sealer that holds it in? I'm probably going to have someone who installs windshields regularly stop by and install it, and he's already got the glue/sealer. I need to know if there's anything more that's needed that would be in the installation kit.