These shots tell the story.  Working our way through the sealing process.  This backyard patio in Scotts Valley was poured in 2002.  It may have been sealed at that point.  Fast forward a dozen years.  It was pretty dirty and in need of some maintenance.  After the wash, we double coated using Glaze n Seal ‘Wet Look 2000’.  The product is costly, but obviously the results can be extraordinary.