In order to maintain a good appearance and functionality, concrete surfaces that have been sealed with a coating type sealer should be pressure cleaned and re-coated every 12 to 18 months. Unfortunately, before you know it, it is 3 to 5 years later and the sealed concrete surface is looking very stained, yellowed and dirty. In these instances there is a good chance that the sealer is permanently impregnated with staining and will need to be completely stripped and then resealed..a timely and costly process. Below is an example of a sealed exposed aggregate concrete surface that needed stripping and then re-sealing. Notice all the stains and dirt that are lodged in the sealer prior to stripping, the majority of which were able to be removed during the stripping process.
Strip & re-seal exposed aggregate – BEFORE
Strip & re-seal exposed aggregate – AFTER
Strip & re-seal exposed aggregate – BEFORE
Strip & re-seal exposed aggregate – AFTER