Always perform a test area to ensure desired results. Although staining block is not a very common practice, there are certain situations where it may be needed or desired. Adjust the nozzle until you have a thick mist coming out of the end. Acid Stains - Also called reactive stains, these traditional stains create a chemical reaction with the minerals on the surface of the block. Follow this up by applying sealer with a paint roller across the center of the wall up to your brushed areas.
Before a protective treatment can be applied, any non-compatible existing sealers, paints or coatings MUST be removed and the surface completely cleaned and de-greased to ensure adhesion and penetration.
Sealing and Waterproofing Block
Again, the key to success is to keep the water away from the penetration area so it doesn't have time to "work" on the sealants. These are very effective, long lasting and offer easy application and maintenance. Removes oils, grease and contaminates from Concrete, Pavers, Brick and many other surfaces. Although staining block is not a very common practice, there are certain situations where it may be needed or desired. Most block masonry installations are held together with cement mortar between the blocks.