I've devised a number of techniques and layer combinations using acrylic paints over the years and I am returning to them for inspiration and to document them on media boards as a resource.
You will find them added to my Tutorials and step x steps page found on my sidebar.
This one - Distressed Gesso Layer - I taught at Ministry of Mixology in April 2019.
1. Paint the substrate with any colour acrylic or chalk paint and before it is totally dry rub over it with a dry kitchen towel, this dries it quickly so you don't need a heat gun. I used Andy's Grey Haze
2. Take some gesso and a palette knife. Hold the palette knife horizontally flat over the substrate and gently drag the gesso over the surface. Don’t push down too hard.
3. Repeat several times turning the substrate round in different directions to get an even random coverage and dry. Once dry you could add another layer of on top if you wanted more texture.
4. Stamp some text over the top using archival ink and make sure it is dry before repeating step 2 again. but only using a very little gesso. This distresses and cuts up the text and pushes it into the background.
5. Dabble some watery prussian blue over the surface spritz with more water to move it about and hold up the substrate to let it drip then lay down again and just give it a little time for the watery colour to settle in the channels and dips before heat drying it,
6. Repeat with a little more watery wash but adding more blue to make it a deeper colour.
7. Finish by adding some splatters using the last of that deeper watery wash.
You can leave the 'clean' look or 'frame' the edges like I have on the Scraped Gesso Layer
(see tutorials list on sidebar).
I also splattered some silver over the background and onto some grey haze painted stars to finish the board.