An ambient epoxy system from HammerHead Trenchless Equipment is specially designed to deliver quick set times — about 1 1/2 to two hours — and working times of 25 to 30 minutes without the need for heat. It is available in 5-, 55- and 275-gallon containers. Epoxy to hardener mix ratios and cure times can be calculated using a free mobile app that can be downloaded from the Apple App Store, Google Play or the Windows Store. 800/331-6653; www.hammerheadtrenchless.com.