There is a gap between the bottom of my concrete deck and the top of the pool tiles on the sides of the pool. A concrete repair person told me it should be filled with a product from the hardware store, and he told me he doesn't do that sort of work. From what I've researched on the subject I'm not sure I want to tackle this myself. My question is, what kind of professional does that kind of work? I don't know where to look to hire someone. Also, if I can't find someone and try it myself, what is the best product to buy and what tools will I need?