B-73 Restoration in Antique and Classic Mack Trucks General Discussion Posted May 22, 2018 2 hours ago, harrybarbon said: Great effort Matt, congratulations for your determination. Considering the near complete refabrication of the cab frame and panels work you are doing, for long term rust and sound and thermal protection/benefits, you may like to have a look at Lizard skin. We used it throughout our B model rebuild as have others restoring / rebuilding their Macks. It is easy to apply and being a water based non toxic liquid paste it will flow into all joints, cracks, corners and pockets of the cab and frame, resulting in 100% seal/protection. It dries quick in warm weather, and you apply no more than thickness of a credit card. If you apply the 2 lizard products, first sound protection and then the original lizard skin you will achieve the best result. And you also should apply inside the door cavities and walls, especially at bottom inside of the doors where water dust and moisture combines. Pictures of our cab and door with the 2 products applied, sound control first and lizard skin on top - must be in this order. We also did underside of the cab, engine side of firewall, underside of fenders and hood. No need to put any other stick on products. There are some good videos on you tube and the lizard skin web site to watch. We found the product around 2003 from a hot rod restoration magazine, it has been available at least 16 years. I was going to use Lizard skin on the entire bottom, then Dynamat over the entire interior. Probably go double thick under the mat for the firewall.