Use small work sections and keep removed material away from the prepared zone. Avoid rounding an edge or spreading debris into a joint while cleaning. Where access is limited, stop instead of forcing the tool angle. A final edge check should confirm what was prepared and what was intentionally left untouched.
metal surface preparation near edges and fasteners needs a methodical approach because nearby features can make the work area look smaller or cleaner than it is. Clear loose debris, inspect the transition to sound
related metal surface preparation guide, and keep holes, seams, and fastener heads easy to inspect. Note any coating changes before proceeding.