Well, here we are months later. We are pretty sure that it is scaling and we decided to have the plaster sanded. There were places that were kind of rough even before the scale so I was looking forward to having nice, smooth plaster. We went round and round with California Pools, the builder. They wouldn't even come out to look at it. Then they gave us the number of the plaster company to contact directly. I called them at least a month ago and they said they would call us. NOT! So I got the name of a company to do the sanding and clean our tile off the Internet. They were supposed to come tomorrow and I just got a call. They need to delay it a couple of weeks. Long story short, can anyone recommend a company to do the sanding here in Inland Empire, CA that is reliable? I hate doing business with someone without any kind of recommendation. Thanks.