POR-15 Prep and Ready (or Metal Ready) has been renamed to POR 15 Metal Prep. It is the ultimate in the relentless fight against rust. It not only dissolves away the rust it also etch primes the clean surface and leaves a Zinc Phosphate coating to prevent further rusting. This amazing liquid is non-toxic, non-flammable and non-corrosive. It ensures perfect paint adhesion and gives better welding conductivity. It can be brushed on, sprayed on with the free trigger head provided or just immerse rusted parts to bring them up like new. Surfaces should be pre-treated with POR15 Cleaner and Degreaser (Marine Clean) for greater effectiveness.