The Professional Epoxy Surface Sealer for surface seal is designed to give a easy-to-mix consistency even at low temperatures. Its thixotropic paste consistency will not sag even when hot from its curing process (exothermic reaction during cure).
At room temperature (75ºF), RadonSeal Epoxy Surface Sealer will exhibit a working life of 4-6 minutes. At these temperatures, it is best to mix parts A and B thoroughly for 45 seconds and begin immediately applying it to the concrete surface. This is especially relevant in the summer months, when the components may be at 75–95ºF, and the product will be setting up in the mixing vessel already within 3-4 minutes after mixing.
It is a rapid-curing epoxy sealer. The crack should be ready for injection 15-20 minutes after the Epoxy Surface Sealer was applied.
Do not mix more than what you apply within 4 minutes.
It is also recommended that if one mix is sufficient to seal the crack, plan on setting the bottom port last (or the port which will be used first for injection). But if more than one mix is needed to seal the crack, use the first mix to seal the bottom section of the crack first and plan on setting the bottom port last - that is where the injection will start.
For example, consider a crack in a vertical wall. Typically, the injection process will begin at the bottom of the crack. If it is going to take less than 4 minutes for gluing all the ports and sealing the surface, begin applying the Epoxy Surface Sealer at the top of the crack and seal the bottom last. But if it is going to take 2 or more mixes to seal the crack, use the first mix for sealing the bottom section of the crack, still finishing with the bottom port. Then continue by sealing the next higher section with the subsequent mix.
The reason for the above technique is that the longer the material is in the mixing container before application to the surface (which typically is at a temperature of 40-70°F), the more heat is developing. As a result, the sealer applied to the surface last will harden the fastest.
This technique should assure that the epoxy sealer closest to the ports where injection will start will be the most advanced in the curing process. Furthermore, if the concrete surface is cool to cold (which slows the hardening process), the material has had more time to initiate its hardening already in the mixing vessel. This procedure is particularly recommended in winter, when the surfaces are cold (but above 40°F).