Was a terrific experience start to finish.  Kenny spent quite a bit of time talking me through the various types of sealers available in the market for travertine stone and their pros and cons, and explained the difference in the national seal product.  While I was a bit nervous scheduling a company out of Florida to come do the job in Houston, Kenny reassured me this was normal business for them.  We scheduled the appointment out about a month and install was on time.  Mark was a pleasure to work with and took the time to explain the application and cleaning process to me.  It rained hard about 24 hours after application and the water just beaded up. I sprayed off the deck about 48 hours after install and the dirt and surface stains just washed away.  Customer service was excellent.  Product did exactly what was advertised.  I’ll be interested to see how long the seal maintains its integrity.  Wish all contractors were as conscientious!  All around was a great experience.