A Core deposit is a form of deposit you pay until returning your old part. If you don't have the core at the time of purchase, you must pay the core charge. That charge is refunded to you when you return the core.
Zero-Rust Zero Rust
Zero Rust is a direct-to-metal, phenolic modified alkyd coating, that controls rust and corrosion by putting down an impermeable barrier at the steel level. Zero Rust has two superior traits:
It provides maximum adhesion to steel. This is called chemical affinity.
Its dielectric ability is extraordinary. It isolates steel from the electrolysis process which converts steel to rust.