Grade 2, or 3 may be used on walls. Grade 3 may be used on overhead surfaces. Resin Injection Epoxy resin injection with the injection machine designed for Epoxy Systems' Injection resin is the only way of assuring quality installation. Caulking guns, pressure pots, or similar batching equipment are not suitable for injection. Limit pressures to 40 psi for most applications.
Excessive pressures can create additional stressing of the crack.
It can also cause hydraulic lifting, rupturing of the cracked substrate, or further elongation of the crack. Low pressures allow gradual resin flow into the crack for deeper penetration. On vertical cracks, injection is start at the lowest point, and continue upward on the crack area. While injecting the lowest port, resin will flow to and out of the next higher port. When pure resin is flowing out the next port cap, plug the current injection port and move to the next port.