Hi , Been reading this site quite awhile, lots of great info. I have started a project I've been wanting to do for quite some time, building a 30 X 40 metal building to use as a shop. I'm in Florida by the way , they poured my pad about 4 weeks ago, all went well till it started to rain just as they were finishing the second half of the pour. they did a machine finish and with the rain I wound up with a white cement coating over the area. I have tried acid washing it off to no avail. So one half looks normal the other is like it's whitewashed . Any suggestions on how I could fix this, really don't want to Epoxy paint and don't trust a stain will make it OK. Will post pics soon as I figure out how. Thanks