In this how-to video, we learn how to apply 3M Seam Sealer and U-POL Raptor Liner to the underbody of a classic car, with a 1971 Chevy Camaro as an example.

See All 39 Photos 4.The outside of the engine compartment side panels reveals many gaps on the unibody where Jason applied seam sealer. See All 39 Photos 5.To fill large openings, Jason uses 3M ...