Since acrylic paint is also not waterproof, it must also be sealed to prevent moisture from leaking out. An additional advantage of using additives and sealants is that they prevent color fading and increase the durability of the surface. Wax and polyacrylic are the best products for waterproofing wooden interior parts. The interior parts are kept protected from harmful UV rays and direct sunlight; therefore, they only require little protection.
Most paints claim to have a certain level of waterproofing properties and yes, most paints are waterproof in some way (excluding the type of nursery that sticks on the family refrigerator).