Gel; 8 Ounce; Evapo-Rust(R) Gel combines the rust removing power of Evapo-Rust(R) with the ability to cling to vertical, rusted surfaces. Simply brush on and allow an hour to work, and then rinse away the rust with water. Also, it is safer than other gelled rust removers. Evapo-Rust get does not harm copper, brass, or aluminum.