How to Restore Color to a Red Brick Wall

Contact a brick expert to assist you with efflorescence:, which is the appearance of a white, powdery, salt substance on the wall. A wall with a history of efflorescence: should not receive an application of a clear-coat product until the moisture source causing the efflorescence is identified and the source removed. Once the source is under control, the white substance can be removed with a mixture of one part muriatic acid and 12 parts water and a stiff brush. Dampen the wall before applying the mixture, and wash the mixture off the wall by saturating the wall with plain water.

Read the clear-coat product directions thoroughly. It is important to follow the instructions closely to receive the results described by the product's manufacturer.

Prepare the wall according to the clear-coat product's directions. Generally, that involves cleaning the wall and allowing it to dry for several days before applying the clear-coat product to the wall. Dirty brick prevents a clear-coat product from adhering properly. Using scouring powder, water and a stiff brush can help to remove most dirt and grime. Reference the clear-coat product's label for specific cleaning instructions.

Allow the wall to dry for several or more days. A brick wall should dry faster when cleaned during dry weather than during wet weather. Humid, rainy days slow the drying process. The wall must be dry before applying a coating to prevent trapping moisture in the brick.

Apply the clear-coat product on the brick wall as directed by the product's manufacturer. Protect surrounding walls, ceilings and floors when applying the product. Always work in a well-ventilated space when using coating products. Follow the application directions carefully.