A Door Latch That Is Sticking

Graphite

• Graphite is a powdered lubricant that comes in a tube and can be puffed into keyholes or around bolts. Some liquid versions are available as well and can be applied in the same manner. Graphite powder should be used sparingly as it can clog up a keyhole if applied too generously. Graphite powder also decreases moisture buildup within the lock.

Petroleum-Based Sprays

• Petroleum-based spray lubricants typically come with a thin plastic nozzle for easy application. This type of lubricant can help decrease rubbing, squeaking and sticking in any part of the lock and latch assembly.

Repairs

• When working with a petroleum-based or graphite lubricant, insert the applicator nozzle into the keyhole and spritz it. Spray around each bolt, bevel and knob or handle. Insert the key and move the lock back and forth, or turn the knob, lever or thumb turn several times to ease the lubricant into the entire assembly. You can also unscrew all of the trim screws and pull out the entire lock assembly, clean it with turpentine or mineral spirits and lubricate it before replacing it back inside the door.

Maintenance

• Locks, latches and keyholes should be lubricated once every six months with a graphite or petroleum-based lubricant. The interior of the lock case shouldn't have to be cleaned that often unless your home has been under construction and a lot of dust has been introduced to the area.