I have an in ground pool that is bordered by a brick patio; the brick patio is set in sand with no cement or mortar. The seam between the patio and coping has been filled with a material that I cannot identify and I was hoping someone in this forum might be able to A. help me identify the material and B. help me figure out where I can get more of it. The material that is currently in the seam comes in a dry mixture that resembles sand. It is placed in the seam dry and then you just sprinkle it with water and the material solidifies, adheres itself to the brick/coping and remains extremely flexible. Great stuff but I have no idea where to get more of it. I have pictures of the material in the before and after state but cannot post here. Any ideas on what this stuff is and where I can get more would be much appreciated.