Hi Hurtin1,
Most likely a mold. Have you thought about buying one of those mold test kits at Home Depot or Lowes? It cost 30.00 dollars to have identified and be patient it took mine 10 days to get to the lab although I do live in Southern California and it took them another 7 business days to identify and email me the results. I can pm them to you if interested.
I believe mold likes latex paint though so you may want to discontinue spraying it with that. Look up mold and the causes. The most important thing you can do is get control of any humidity problems in your home whether it is from leaks, foundation, incorrect sloping away from your fondation of water, or condensation etc.
Mine came back Aspergillus, and Cladosporium. They both can affect us in many ways.
__________________ "In a time of universal deceit, telling the truth is a revolutionary act." ~ George Orwell |