Rocksteel is the only product I use. Works like a champ. Water beads on the stone like rain on a waxed car.

Not sure where you are located, but Noble Tile is selling it here in Houston. Your PB should be able to buy it for you.

A pump up bug sprayer from Home Depot and a gallon or two of Rocksteel and your golden.

Can anyone tell me if a sealer is recommended on a tumbled travertine paver deck? What will happen to the stones if it is not sealed. The pool is not saltwater system.

With the pump sprayer, is there any problem with accidental overspray getting in the pool?

The spray can get in the water.
It creates a little "oil slick" for a day or two, but wont hurt anything.
Just do a backwash on your filter after a few days.

If you have a cartridge filter, I would worry about overspray.
If that sealer gets in the pleats, it will never come out and will clog.

I have a quad cartridge system and was advised to brush/roll my sealer on.