You can use GF products over wall paint, but proceed with caution. Latex wall paints are engineered for a different purpose than wood finishes. Walls generally experience less wear and tear than horizontal surfaces, so they are manufactured without the resin systems that make furniture paint more durable.
Note: Latex wall paints must cure for 7-10 days before glaze or topcoat can be added.
WARNING: Keep in mind that GF cannot guarantee an ideal finish when applying our products on top of or in combination with another company's products. We always recommend that you test for durability and aesthetics on an unseen area of your project before getting started!