I've got Soltan 50spf BB cream for face. It's marketed and sold as sun protection rather than makeup, and I like it because in the summer I don't need a foundation or anything with it. But presumably it's chemical (can't confirm this as can't read teeny tiny print on ingredients list. But if it is, it should presumably go on underneath serum? But putting serum on top of your coloured 'base' also seems weird? I asked the 'sun care consultant' but she seemed confused and insisted sun cream always went on last. What do you think?