You can spray the surface with a sealant or cover it with gypsum wallboard. The new paint may also partially mix with the lead-based paint, and lead dust will be released when the new paint begins to deteriorate. Have the lead-based paint removed. Have professionals trained in removing lead-based paint do this work. Fumes or dust can become airborne and be inhaled or ingested.
Wet methods help reduce the amount of lead dust.
Removing moldings, trim, window sills, and other painted surfaces for professional paint stripping outside the home may also create dust. Be sure the professionals contain the lead dust. Wet-wipe all surfaces to remove any dust or paint chips. You can remove a small amount of lead-based paint if you can avoid creating any dust. Any job larger than about one square foot should be done by professionals.