What do you guys do about the level of sand in joints? Do you fill all the way up which leads to the sand running when it rains the first time? Do any of you leave it halfway? Just wondering what everyone does, I usually fill it to the top but have customers ask me to come back and sweep it again a week or two later. I know there are products out there to like polymeric bonding sand but no one wants to pay extra for it. Not a real problem for me but sometimes an inconvenience.