I don't think we'll have a huge problem in general but things will become less convenient. Water based paints any consumer can buy at any point and use without

I don't think we'll have a huge problem in general but things will become less convenient. Water based paints any consumer can buy at any point and use without worrying too much and get decent results in any color you name are great. We might have a harder time with traditional limewash. It is rather caustic and takes a long time to prepare. And while you can achieve different colors with it, it's not the uniform easy perfectness modern paints have. It also has to be re-applied periodically, so it's not as hands off. It's a bit like gyp rock. You can buy these sheets that go up quickly and easily even for the lay person (I've built a wall). Lathe and plaster existed before that and worked well enough. It's a lot more work though.