3M Wall Repair 3 IN 1 Spackle Tool helps homeowners, renters, pros, students, and office teams complete small interior wall repairs in homes, offices, dorms and rental apartments. The bottle includes color changing spackle, a built-in putty knife and sanding pad for drywall, wood repair, plaster repair, nail holes, dents and dings after pictures, hooks, shelves or wall decor are removed. The spackle applies blue and dries white, showing when the surface is ready to sand and paint. This lightweight formula resists sagging, dries hard and usually requires 1 application for smooth paint ready wall repair.