Hi! Our plasterer surprised us last night with a call that he was coming today and not next week. He is going to do an acid wash this evening and not tomorrow. He told my husband not to add any MA and that the kids could swim over the weekend if they wanted before we started with any needed acid b/c of the acid wash. Is this ok? Is the plaster hard enough to not be damaged if they just play a little? I think he knows that we feel as though we have been left on the back burner over the last month so he is trying to make my husband happy. HELP!!