How can I repair this chalk paint job (pic in comments)?

This is the image i missed in the post

What is it your trying to achieve? a solid white paint job, or a whitewash?

If solid, I would give it a light sand and prime it with either Kilz or Zinseer. If that is wood resin bleeding through, I would use the Zinseer Bulls-Eye.

If your looking for a white wash effect, sand down more until there is more wood grain showing through. If you need to correct the whole thing, I would strip it. Then mix your paint with 1/2 water / 1/2 paint and use a rag to apply and rub off the excess.... you can always add a bit more but its much harder to remove excess.

Completely agree with Sharon. Zinsser Bulls Eye is great for complete coverage if you want zero wood showing.

Make sure to clean well after sanding or roughing existing finish. I prefer denatured alcohol for the clean up before priming and painting. This, along with the finish scratching easily, is why I stay away from chalk paint.

What do you want this to look like?

Totally agree with the Zinsser Bulls Eye. But it really looks like you just need to keep painting with the chalk paint. Apply 2 more coats and it should look more like a solid white finish. :)

Chalk paint doesn't cover well the first and sometimes second coat. If you didn't prime (I use Kilz) then you may want to sand it lightly, wipe it down and seal it before applying. I know many will tell you no prep, but that hasn't worked for me. Old finishes often bleed through. Then, when it looks the way you want it, seal it with wax or a clear water based sealer.

I would prime it, Kilz is my absolute favorite Primer. I would do 1 or 2 coats of it and then paint.