Review on 🔘 310 mL Cartridge of 3M Black Urethane Seam Sealer, Model 08367 by Dragan Nelson

#1 - You do not need a dedicated 3m caulking dispenser/caulking gun, a standard caulking gun works fine. This material is excellent for sealing new rocker panels, body seams, leaks and glass. It's strong and durable. It's not the easiest anti-aliasing, but if you take your time it's fine. Do not open the cartridge until you need it. Once opened, it doesn't have the longest shelf life. To expand it when you're done, be sure to close the top and bottom opening. To seal the bottom I used a piece of Gorilla tape and taped it to the bottom as shown in the photo. To seal the end of the ferrule, unscrew it, place shrink wrap over the hole, and screw the screw into the ferrule. Then reassemble everything. This should take several months.