Oily skin can make even great makeup look completely different by lunchtime. Foundation starts separating, concealer creases, powder gets cakey, and blush seems to disappear—but the solution isn't necessarily piling on more powder. I looked for formulas that address different reasons makeup breaks down on oily skin, from oil-controlling primers and long-wear foundations to finely milled powders and setting sprays. I also considered the formula, finish, skin compatibility, real-world reviews, and what you can realistically expect from each product.