It’s been a while since I did anything with gesso. I used it two years ago in my Please Don’t Cry piece, and I’ve been itching to try using again since then.
The process I used in this video where I just used the gesso is probably the most time consuming method you could use. If you want to thicken up the gesso and not layer quite so much you can add flour, plaster of Paris or even wood glue to the mix. My favourite mix is to do 1/3 gesso, 1/3 flour and 1/3 wood glue. It’s so much thicker and the wood glue makes it quite forgiving and pliable.