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We have a large patio laid with Marshall Saxon Buff paving.
This has been down @ 7 years and is power washed annually. Despite this as it ages it appears to get dirty quite quickly.
Are there any sealants within your range you would recommend?
Regular pressure washing of any paving is quite bad for it, it accelerates the wear damage and significantly reduces the life of the paving.
I would suggest using our Block paving sealer (link below) this will protect the surface and reduce the need to pressure wash and reduce the damage it causes.
http://www.adseal.co.uk/Block-Paving-and-Imprinted-Concrete-Sealer-SP.html
Drew Palin