I have heard that some of the self-healing polymeric sand ends up washing out quickly, and some can stain pavers if not installed properly. I have about 1/2" to 3/4"

gap between my molded Quickcrete "stones" and I wanted to get opinions on which is the best brand of Polymeric sand to get because I only want to do this once and the sand is not cheap! Please let me know your experiences (Good and bad). Thanks.