A movement crack needs reinforcement, not just filler — bed paper-thin fiberglass mesh over the cleaned crack in setting-type base coat, then float a wider sandable top coat over it, and the repair bridges the movement instead of reopening.
The half-moon on a painter's multi-tool cleans rollers and everyone knows it. The notch cut into the middle of the blade is a nail claw — hook a proud nail or screw head into it and lever it out without going for a hammer.
