StoneLok E3/2K is a 3-part system rather than a single product. The concrete is first conditioned with a water based silane (OS/W), which promotes better bonding between the Stonelok E3 and the concrete.
Application of the OS/WTM amounts to wiping it on and letting it dry. Stonelok E3 (or just "E3" for short) is a water based epoxy that serves as a stain barrier and as a "primer" coat that is applied to the concrete. The final step Stonelok 2K CT (or just "2K" for short) is a water based urethane designed for concrete countertops that serves several functions. It is a stain barrier, a wear layer and it provides the sheen. Stonelok 2K CT comes in gloss, low gloss and an extra-low gloss version. It can be used indoors and outdoors.