Richard. You are wise to be concerned about grout. After 45+ years in the construction business there is no way I would even consider that. Grout is not flexible and there’s no structural value to the grout so its pretty much guaranteed to chip or crack. Once that happens you will suffer water intrusion followed by more rusting of the steel. That swells and encourages even more spalling of the concrete. EPOXY resin is the answer! There are products formulated for concrete applications. Sika comes to mind but there are others. That’s not to say that West system won’t work. If it were me, I’d clean and dry the concrete and then paint a couple coats of thinned epoxy followed by a couple coats unthinned with some kind of reinforcement. There are fibers that can be added to the mix that will add strength without decreasing the epoxy’s flexibility. Thats the view from the cheap seats! Let us know what you decided an keep us posted. As Rudy likes to say, You are gonna have fun! Regards, Randy Pickelmann Cool Change-lying Rockland, ME www.CruisingMorningStar.com