Chalk paint- I've heard so much about it. Which is best? How to use?

I use Annie Sloan paint, no sanding except anything loosely chipped, and use wax to seal. Does great on tables.

I made my own with baking soda. It worked great until it got very humid. Now my furniture that I painted with my homemade chalk paint is literally sweating from the humidity. Actual water forms and drops to the floor. Does anyone know how to solve this problem?

I've only used purchased chalk paint, although I have mixed the chalk paint with latex paint to get a color I wanted. I usually purchase Waverly paint at Walmart. I have used name brands such as Annie Sloan, but, haven't found them all that much better (and much more expensive). I use sealer on a surface that will get a lot of use, such as a table. You can use the sealer made for the chalk paint, or any clear sealer. Poly can turn very light colors yellow I found out the hard way (had to strip it off and start over).

I bought calcium carbonate because after a lot research, that was what I wanted. I painted a table about 6 months ago, using paint I picked out and bought from a respected brand and adding the CC, I wanted a matte finish, not distressed at all, and this is what my research led me to. So far, it works great, looks great, and much cheaper than these manufactured brands.