I have a problem with an erosion issue. Not boat related but, I’m sure a solution will come from the boating community. Several pool coping tiles under a waterfall from the spa into the pool are eroding. I had the older tiles replaced about a year ago. An expensive repair. With much discussion concerning penetrating epoxy for many wood working boat projects what products might be useful for penetrating and overcoating a masonry issue. Product brands and types recommended will be helpful. Thanks in advance, Paul Weakley