It is generally not recommended to mix oil and acrylic paints together, as the two types of paint have different formulations and drying times that can affect the final result. Mixing the two types of paint can also lead to issues with adhesion and durability. If you want to use both oil and acrylic paints in the same project, it is best to use them separately, applying the oil-based paint first and then the acrylic paint on top.