Step 7. Apply Finish
Tape off the edges of your chalkboard with painter’s tape to protect it from the finish. Apply stain with a paintbrush and wipe off excess with a paint rag. Be sure to cover your work surface and work in a well-ventilated area.
Allow the stain to dry as directed, then apply a few coats of varnish with a clean paintbrush, as directed. Let the final coat dry overnight, following the manufacturer’s suggested dry time.