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I'm looking for a waterproofing sealer that I can apply to the mortar on my waterfall. I'm having a hard time finding something that says it can be used in underwater applications. Any ideas?

I need to resurface a 25yr old pond in my backyard. It was constructed with bricks and mortar for the shape and then coated with what I think to be plaster. The plaster has developed many cracks and bare spots over the years and it needs another coat. How should I prep the surface before...