If you sand it you probably need to wax it first to reduce the dust [not if you're planning to eggshell it, though]. Then I'd get some Annie Sloan chalk paint. I do use Rustoleum but Annie Sloan is still the best and easiest to use.
On advice from the stockist, we watered down our paint. It’s too gloopy otherwise. Looking at a randomly selected site online, it says to rub over with fine sandpaper after the final coat has dried, then wax.
I wish I handn’t now, I like the dull flat finish but not the roughness and paint brush marks. Yes, there is wax to protect it but loath to use this as would be impossible to paint over.
I am painting a large pine dresser with Rustoleum chalk paint, it says no rubbing down required. However, after third coat the finish is dreadful, I think I should have sanded, under coated and then normal eggshell finish paint. I am now thinking of sanding whole thing back and putting on a coat with eggshell finish. I did base coat of shellac so no bleed through, just a rough finish. Any advice please.