Solder Seal M-P Sealant And Conditioner Jar

Solder Seal M-P Sealant Conditioner Jar  This is a new old stock Solder Seal M-P Sealant and Conditioner glass jar, commonly known as "Freeze Seer" or "Nite-O-Rust," which was a liquid product used to seal cooling systems and condition water in automobiles.  Great shape.  1950s-60s.  Grumps Collectibles So-Cal.