After giving the chair a quick dusting, I mixed the grey chalk paint with equal parts of water. I wanted it very runny so it would soak in good. I used a spray bottle filled with water and sprayed each section first so it was pretty damp to the touch.
I used a pretty thick, cheaper brush, and just loaded it up with the mixture so the brush was dripping. I used a mixture of usual paint strokes but also swirled it around, really working it into the fabric.
This is quite a messy process so have a rag handy to wipe up the drips and protect whatever service you are working on if needed.
Once the first coat was on, I let it sit for 24 hours to fully dry.