This has been discussed several times, please do a search on this site. be careful, if the bricks were sealed before you will need to be careful which sealer is used there can be a compatibility issue. Also, the sealer needs to be applied during a period of low humidity to reduce the possibility of moisture be trapped and causing cloudiness in the new sealer. Do not be surprised if the old sealer needs to be removed.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV.
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