To plaster a brick wall, wash the wall, replace damaged mortar, mix plaster, and apply it to the wall. The supplies you need for this one-day project are gloves, water, salt, soap, a scrub brush, a putty knife, masonry caulk, a caulk gun, scissors, drop cloths, plaster, buckets, a ladder and a trowel.
- Wash the wall
In a bucket, make a paste of dish soap and salt. Add a little water, and mix the solution until it is the same consistency as cream. Apply the mixture to the wall, wait 10 minutes, and work it into the brick with a scrub brush. Rinse the wall thoroughly.
- Replace damaged mortar with caulk
Inspect the wall for chipped and rough mortar. Remove the imperfections with a putty knife, and fill them in with masonry caulk. Put on rubber gloves, then dip one finger in water, and run it over the fresh caulk until the surface is smooth. Let the caulk dry according to the manufacturer's recommendations.
- Mix the plaster
Read the instructions on the plaster tub, and open it. Mix the plaster with water, and put some of it into a small bucket.
- Apply the plaster
Cover the ground with drop cloths. Set a ladder at one end of the wall, and climb it. Bring a trowel and the small plaster bucket with you. Apply a thin layer of plaster, starting at the top of the wall and working down in parallel lines. Move the trowel in upward diagonal strokes. Let the plaster cure for 30 minutes, refill the small plaster bucket, and apply a second coat. Give the plaster six weeks to harden.