There are 2 basic types of sealers, water based and chemical based, and they may not be compatible. If you do not know which is currently on the pavers, make sure to test in an inconspicuous area. As for the actual sealer, we have been advised not to have our driveway sealed due to possible clouding of the sealer from excess moisture. So when you find a vendor, be sure to discuss these items, and get a warranty in writing.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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