The painting above a background might begin to peel.
Chalk painting over stained wood.
And if you use a water base poly on top to seal it it may give you a crackle affect which you may or may not want.
Then follow these general preparatory steps for painting over stain.
Wipe off any excess paint around the paint cans using a clean rag before storing.
First clean the stained surface with soapy water to remove any dust dirt and cobwebs.
Next to dull the stain lightly sand the surface with 150 grit or finer sandpaper moving in the direction of the grain.
There are numerous varieties of paints that are either sterile or solvent based that generates unique finishes that are measured by its sheen component.
If you use a light color paint the dark wood might bleed through.
Lightly sand with the 220 grit sandpaper over areas that feel rough to the touch apply 2nd coat of polyurethane.
Stain over chalk paint though the paint is a little thicker than latex then it will not automatically cover in 1 jacket.
Allow to dry overnight.
To eliminate these problems seal it with a coat of shellac first and then use your chalk paint.
Allow to dry overnight.
Amy howard chalk paint in linen is what i used.
Sand any areas that feel rough and you re done.
That should prevent bleeding and crackling.
Wood stain in color of choice if i were to do this over i would select minwax dark walnut paint for table and chair bottoms.
Another chalk paint option is annie sloan old white.
Apply with a high quality brush in a very thin coat.