Today and in the future oil based paints (alkyd) are becoming obsolete and in some places banned. Many of latex paints are equal to or better than their oils counterparts. We generally use 100% acrylics. Acrylics are water-based and also referred to as Latex. Some of the benefits of Latex paints are that they retain color better, have better elasticity, more mildew resistant. As well as other great characteristics including ease of clean up.
You can use water-based over oil, and can use oil over water-based. However you cannot just apply the opposite on top each other without proceeding with caution and some specific steps. First sand your latex or oil to scuff them up a bit, this will allow the primer to adhere better, next step is to clean your substrate well, using trisodium phosphate (tsp) and water, and now you are better prepared for a lasting finish, prime 100% I recommend a coat of oil-based primer.
How to: Testing if your paint is oil or latex? In an inconspicuous spot, use a cotton ball soaked acetone or denatured alcohol. Rub the area if the paint rubs off and feel tacky, its water-based (latex) paints. Oil based paint will have no reaction. You may be able to tell by rubbing your hands over the paint oil is usually smoother and latex feel rubbery
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