Last year I installed a pea gravel patio at my house. What I did was put down about 5 inchs of AB3, wetted it and then tamped it down to a hard surface. On top of that I put about 3 inches of pea gravel. Its comfortable to walk on with no shoes and also nice to look at. The problem is that it doesnt stay tamped down. Soon after it becomes very loose. I was wondering if there was any sort of spray epoxy I could put on it to keep the gravel from moving. A hardner of sorts. Anyone have any ideas?