Objective: How to paint a door.

Which of the following solutions is more sound in terms of naive physics reasoning?

OPT: (i). Begin by sanding the surface of the door with a paintbrush. Start by painting the inside hinge edge, working around the door in one direction. Next, paint the door's surface. When everything is coated let dry.. (ii). Begin by sanding the surface of the door with a toothbrush. Start by painting the inside hinge edge, working around the door in one direction. Next, paint the door's surface. When everything is coated let dry..
(i).