I see you used the polycrylic.
Painting dining table with chalk paint.
Prep the surface by cleaning it real well with a lint free brush and sanding with a fine grit sandpaper.
I used two coats which covered it well.
In addition to the brown sealing wax there is also a white wax and a black wax.
The first time i used polyurethane for top coat and it yellowed.
Needless to say i sanded the whole table down and started again.
Without interruptions you can easily chalk paint a dining table over the course of 3 4 days or 1 week at most.
With the chalk paint sealing wax they are available in a couple different colors.
I painted my dining table using annie sloan pure white chalk paint.
I keep researching and i am not sure what to use to avoid that yellowing appearance.
First coat of black chalk paint.
The bottom portion of the table and chairs were painted amy howard one step paint chalk paint in black.
One of the most common being a brown wax which adds an aged antiqued look to whatever it is you are painting.
Apply the painters tape around the edges if needed use a bristle brush or round brush to apply the chalk paint sand in between the coats to ensure a smooth.
I mostly worked on it during the evening hours whenever i had time and it took me about 3 weeks.