Sealer Primer For the record, a sealer primer does just what its name implies: It seals the surface as well as primes. The sealer component acts as a barrier between the substrate and the topcoat.

He had also sealed seams that will go under primer or paint. The car was ready for spraying, and the final application of seam sealer.

Using seam sealers to finish your muscle car restoration will give it the perfect factory-correct look. Here’s how to do it right.

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.