There can be a number of ways that concrete crack filler will dry. Some companies may apply it to the crack immediately after injection and finish it off relatively quickly, while other companies may apply a brick-like material to the crack and allow it to dry over several months or years. This is because the cure rate for cured pigments is much lower than that of cured polymers. Also, each company has their own different strain rate for curing polymers, which means that the cure rate may change with time as well.