If you’re using silicone as a gasket material, the goal is to apply just enough silicone so when the pieces are assembled, there is just a slender thread of silicone extruded along the joint.

Some materials, such as water-based rubber and acrylic sealants, as well as roof sealant tape, are much easier to apply than solvent-based silicone or polyurethane.

Apply silicone caulk or product-specific sealant to each door, window or other openings where the j-channel meets the structure. When to Call a Pro Safety first is a good rule.

Last year, in snowy, freezing weather, the rubber around the door frame of my car stuck to the metal. I am afraid that the rubber is going to tear.