Hey guys I am new to this forum I have been working on doing my ceiling in my kitchen. My house was built in 1900. The ceiling paint is peeling in some places ( not all) I am unsure if I should just remove all the paint and start from scratch or only do the 'loose'paint the other problem is that in some places where I peel the paint a grainy grey substance exist and I don't think I can paint over that.. what is that stuff and how should I handle fixing the ceiling? thanks guys!