I saw this on one of the gardening shows this morning. It appears to be about 1/4 inch minus, or perhaps a bit bigger, which makes it useful as ballast. The neat thing about it is that you spray it down with water a few times and it becomes “firm but flexible.” I wish that is all it took for me, but I digress.
Apply it like any other ballast, use a fine mist to wet it down, and bada-bing, bada-boom, you are golden. Ballast that will give a bit, but will withstand Fido’s of even Bambi’s transgressions into the railroad If you decide to change your track plan, give it a good soaking and you can easily remove it. It will withstand even a gullywhomper, so they say. I have no idea how much it costs, but I am going to check it out.
It is made is several parts of the country, I chose this product because it is made in Seattle. I found it by Googling “ploymeric sand.”