No idea no this company, but the company that painted/stained our driveway around 9 years ago no longer suggests additional sealing, the reason it is easy to get moisture sealed in and then the sealer turns cloudy. So my advice check with whomever did the original driveway and see if it actually needs to be resealed, then choose an optimal time of year to have the work done.
Just a note, our driveway (and several others in the block) have never been resealed and still look great.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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