SP Interlock is a concrete “conditioner” for use on aged and weathered concrete. It is a combination of non-acidic water-soluble agents, which penetrate through the open pores. Once absorbed, SP Interlock works to replace lost solids within a concrete surface before being over-coated with Rust Grip®, Enamo Grip, or other coatings.
https://spicoatings.com/sp-interlock/