Gel Rust Dissolver adheres to large surfaces to dissolve rust...no need to submerge the metal Eastwood's Gel Rust Dissolver harnesses the powerful rust-dissolving properties of our popular liquid rust dissolver and puts them into a sticky gel, so no submersing is needed!WARNING: This is an acid-based formula that can damage aluminum and plated surfaces like chrome. Also, this product can be corrosive to metals so only allow it to stay in contact with the substrate long enough to remove unwanted rust.