Epoxy crack filler is a two component material used to fill cracks and control joints in concrete. When part A is mixed with part B, the hardening process begins resulting in a solid composite with incredible compressive strength, usually greater than that of concrete itself. It bonds well with concrete and is impermeable to water and moisture vapor.
The crack filler comes in two paint-like containers that require manual mixing. It is also available in dual cartridges that fit into a special caulk-like gun and is mixed automatically as it's applied.
Epoxy is used to eliminate water seepage coming through cracks, since it is impermeable to water.
Epoxy is also used when preparing concrete for overlays and coatings in hopes of permanently covering up cracks and control joints. The word "hope" is used because there is never any guarantee that cracks won't come back through, but epoxies provide the best strategy against crack transfer.
For hairline cracks, simply pour or inject the epoxy along the cracks and let it seep down in. If this is preparation for an overlay, sprinkle dry silica sand on the wet epoxy to give the overlay material something to mechanically bond with.
For wider cracks and control joints, fill them half way with dry silica sand first. Then apply enough epoxy to completely saturate the sand. Fill the rest of the way with more sand and apply more epoxy. When it starts to get sticky, scrape it flush with the concrete.
Allow at least 24 hours to harden before introducing any foot traffic or furthur floor treatments.
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