What is Stencil Vinyl?
It is vinyl that is made specifically to be used as a stencil. It’s edges are supposed to seal to your project better than regular vinyl. When the edges seal better, there is less likeliness of paint seeping under the edge and more likeliness of crisp lines.
Popular options for stencils are Avery Dennison High Bake Paint Mask, Oracal 813, and cost effective Oracal 613.