How to Repair a Crack in a Concrete Pond pt.2

The first thing I did was to "grind" the previous RayCrete patch with a disk sander. I was surprised to find that the sanded RayCrete looked better. I guess the sanding removed the glossy surface sheen.

To color the RayCrete, I used Jack's suggestion to use some pastel chalk and sandpaper to make some filings. I could not find any black chalk, so I ended up purchasing some inexpensive colored chalk. The colored chalk contain a concrete gray colored chalk that I used to color the RayCrete Part A. It took two attempts with more gray chalk filings before I got the color about right.

It was not easy applying a thin layer over the previously repaired area because of the product's consistency and short curing time. The colored layer had a shiny sheen like the uncolored patch.

The colored patched layer looked better after sanding. As I said before, in a couple months, a carpet of dark algae will cover the patch.

UPDATE: After time, the chalk-colored RayCrete patch faded back to the original color. Coloring the RayCrete with chalk was a waste of time, but sanding the RayCrete improved the look.

UPDATE 2013: My patched concrete pond (built in 1981) is still holding water with no leaks! Although RayCrete is no longer available, I have found a similar product called Pond Shield. Google search; "how to fix a leaky fountain" and "40 year old cracked pond repair".

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