If you want to protect the bricks outside, without changing much of its original and rustic, it is possible to apply a product especially for bricks and such surfaces.
It’s kind of clear varnish to water, formulated based on silicone. Usually no film or layer form, which makes the protected material to breathe and release moisture, preventing the flowering of the product and the formation of blemishes. Also prevents water from outside, as rain and humidity, from entering the wall. Not recommended staining the product with universal tints or toners. The finish can be matc, that is dull, and satin. It recommends the application of 3 coats for full protection of the surface and to achieve the necessary gloss satin finish. Its application can be done by brush, roller or spray.
Surfaces may be protected
Your application is not limited to outdoors but also indoors in rough walls exposed bricks, concrete, cement, brick floors, plaster or stucco, tiles, stone and unglazed ceramic.