Touchstone Duropoxi SC is a two-component, exterior grade, non-sag gel epoxy. (water-cleanup). The 1 part A to 1 part B ratio makes it easy to mix and use for job-site applications. There is no shrinkage of this system that contributes to adhesive cracking and related pop-off issues. Initial set time at 75°F is 4 hours. Only mix enough product being used within 15 minutes. Do not use on a substrate at a temperature below 55°F.