My wife used to run a chalk paints franchise. It wasn’t Rust -Oleum but Annie Sloan. You can add water to the tin in small amounts and stir in to allow the paint to cover more smoothly. More than one thin coat is fine, especially because each coat dries so quickly. Sanding will smooth the finish but also clear or dark wax and buffing can give a good, deep sheen. Good stuff for experimenting: you can always paint over your cock-ups!
Sent from my iPhone using TZ-UK mobile app