Using a small glue gun that I had on hand, I created two abstract stencils to use in painting. When I make more of these stencils, I'll purchase a more heavy-duty glue gun. The latter will be easier to work with.
If you plan to make stencils, work on a heat-resistant pad or parchment paper. The stencil easily lifted from the parchment paper that I used. I let the stencil cool first.
I recently purchased silicone caulk. I'm going to experiment and make some stencils with the caulk too.