I use the pencil tool with SAI’s native paper texture both for sketching and for applying opaque color with no blending.
I’ve been getting a lot of asks lately about the brushes and textures I use in my work, so here’s a BIG FAT REFERENCE POST for those of you who were curious! Bear in mind that I’m really lazy and don’t know what half the settings do, so don’t be afraid to experiment to figure out what works best for you :>