Coated building panels and articles containing calcium sulfate hemihydrate

A coated interior panel comprising:

• a building panel comprising one of the group consisting of gypsum panels, cement panels, panels having both gypsum and cement and mixtures thereof;
• and
• a primer coating on the panel surface obtained by applying to the panel surface a coating having a thickness of about 5 to about 20 mil when said coating is wet, said coating comprising:
• 10-40% by weight of a latex emulsion binder having a molecular weight greater than 10,000 Daltons;
• 30-80% by weight calcium sulfate hemihydrate;
• less than 8% by weight of a dual set inhibiting agent, wherein the dual set inhibiting agent consists of a first set inhibiting agent and a second set inhibiting agent, and wherein
• the first set inhibiting agent is a compound of 0.1% or more by weight selected from the group consisting of tetrasodium pyrophosphate, tetrapotassium pyrophosphate, aminotri(methylene-phosphonic acid), diethylenetriamine penta (methylene phosphonic acid) trisodium salt, hexamethylene diamine tetra(methylene phosphonic acid) and mixtures thereof;
• and
• the second set inhibiting agent is a polymer of 0.05% or more by weight and having a molecular weight from 2,000 Daltons to 6,000 Daltons and selected from the group consisting of a polymer made from a monomer selected from the group consisting of vinyl acrylates, vinyl acetates, vinyl chlorides, ethylenes, styrenes, substituted styrenes and mixtures thereof;
• and
• 10-40% by weight water;
• and
• wherein said coating does not comprise a set accelerator.