Sorry. I got distracted then eventually went to sleep. Sorry
Chalk paint is meant to look 'brushstroked'. If you don't want that look you can use a very soft, long & smooth bristled brush. Do ONE coat & leave it alone. You can sand between coats for a smoother look & you really shouldn't need more than one coat. If the paint feels too thick you can water it down a bit but I take a bit of out the tin & use a sports water bottle that you can drip into the paint - just a couple of drops at a time.
For things like kitchens you're best to use a lacquer after, rather than wax, as it's more durable. I use Polyvine which comes in Matt, Satin & Gloss.