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As a rule, only stone that will be exposed to soil and stains needs to be sealed. Most stone will absorb moist stains; however, granite is sufficiently dense that most stains will rarely penetrate the surface.
As a rule, moist environments, such as a shower, should be sealed and resealed annually. A shower is a hostile environment for slate, marble and other natural stone. The stone should be cleaned and professionally sealed annually to maintain the best appearance. The rest of the bathroom could be sealed and cleaned on less frequent schedule.
As a rule, floors connecting to the outdoors should be sealed to protect against soils tracked in. Foyers and other main floor rooms will be easier to clean and retain their appearance if they are sealed.
Porous stones and concrete in living areas should be sealed. Sealing porous stone facilitates cleaning and protects against stains.
Most outdoor stones should be sealed appropriately to the environment. Granite and native field stone that will achieve a desired patina in the garden should not be sealed.
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