When I need to sand the inside bottom of a vase I like to use a sanding stick made out of styrofoam. The stuff they sell at Home Depot, etc to insulate foundations. They call it “Rigid Foam Board Insulation”. I use the 2″ thick stuff.
I like to spray Chroma Craft Wood Dyes from cheap Harbor Freight Airbrushes. The airbrushes are cheap. Around $22 each on 4/30/2022. Thus, I like to have one airbrush for each color. Like Nick Agar does in his demos and classes.
The airbrushes are a pain to deal with when not in use. They don’t stand up on there own. Thus, I created a cheap holder out of a 2×4 with a series of 1-1/2″ diameter holes.
I painted the 2×4 white so I could spray color samples next to each hole.