Kitchen ceiling was painted about 12 years ago with semi gloss paint. In the past 2 years I noticed areas where paint looks like it has been shrink wrapped and more so recently. What is the problem and how do I correct it before painting again? I would like to

We just moved in to this house with a Stucco exterior and we would like to paint it another color. I can not tell if the paint on the house is oil based or water based. I tried the acetone test but nothing came off on the paper towel. Do