For the best results, we always recommend using the same type of paint from top to bottom. For instance, acrylic paint can NOT be painted on alkyd paint. However, alkyd paint can be painted on acrylic paint after the acrylic paint has dried for approximately 60 minutes. Acrylic paint can be painted on waterborne Zero spray paint, either wet or when the Zero layer is fully dry. Alkyd paint can NOT be painted on Zero.