Corrosion Block Liquid 4-Liter Refill - Non-Hazmat, Non-Flammable Non-Toxic *Case of 4* [20004CASE]Liquid 4 Liter Refill Non Hazmat, Non Flammable & Non Toxic *Case of 4* Corrosion Block is a clean fluid that actively protects metal using advanced polar bonding chemistry. Synthetic additives in Corrosion Block completely penetrate corrosion cellsreplacing the salt water which is then allowed to evaporate. Corrosion Blocks hydrophobic film remains to further protect the metal acting like an OFF SWITCH for corrosion. Unlike waxy products Corrosion