Roughness and stains are a reaction of lack maintenance in the water chemistry especially in the first 2 weeks that are essential during the cure and brushing processes, this is not a plaster issue, National Pool Council can answer all this questions and clear your doubts. Very happy with the work

Plaster was done in 2011 and from the beginning had some roughness issues and some discoloration. Initially they seemed willing to help but then blamed the water chemistry. I have pics to show it was there day 2. Not happy.