For my substrates, I'm recycling some picture boards (not sure what to call them but you can see them in the picture). I get them for pennies at a recycling depot in town, so they're perfect. I sand them, cover them with gesso* and then I'm ready to go (research gesso vs. encaustic gesso if you're planning to do this).
I wanted some heavy texture in this piece, so I pulled out the drywall compound again, and using a stencil I applied a thick layer of compound with my fingers, making it easy to control where I was applying it without having to mask off the stencil.
Needless to say, this needs a bit of time to dry, especially because of the fairly thick application.
I'm now ready to add some collage elements and start playing with the wax medium!
I'd say I still need to work on my use of this medium...a lot!...but, here's my first attempt at encaustic. It's a very interesting medium to explore, but as you can see, I have a ways to go before I get a handle on this.