General Finishes Milk Paint is a premium interior/exterior mineral based paint named for its low-luster sheen, which mimics the look of old-world furniture paint. It is not a powdered, casein-based milk paint, but a premixed, durable, self-sealing version. GF Milk Paint is a premium self-sealing finish and does not require a topcoat. Do NOT use any type of clear topcoat over white or light GF Milk Paint Colors, as it may cause yellowing when used over wood substrates.