So far it's been a few days after fixing the wall with this & it's true what it does, within 15 minutes it was already going hard & we had to work quick, but the end results it has gone solid & seems to be working very well & keeping the wall strong, even the color looks almost the same at the wall. Im looking to by more for another wall & to repair a step. I just love that it works fast & don't have to worry about taking forever to dry.