Is it necessary to wax chalk paint?
Consequently, what happens if you dont wax chalk paint?
There is a potential downside to a poly finish that isn't an issue with wax. Poly topcoats can sometimes pull tannins from the wood through the porous chalk paint, creating yellowish (or sometimes pink) spots. Wax doesn't react with the wood the same way a poly does, which is why this doesn't happen with wax.
Thereof, do you have to put a top coat on chalk paint?
Bare or No Topcoat Leaving your chalk-painted surface bare, or with no topcoat, is the simplest treatment with the least alteration to the finish. However, adding no protection means your piece is vulnerable to the elements, wear and tear, and natural distressing.
Use what works best for you and suits your piece. Most chalk paint brands say you can choose to leave it unsealed too, but I don't recommend it. Chalk paint is very porous and will pick up stains and look a mess in no time if you don't seal it with something.