I recently purchased a house that has a pool. During the pool inspection, it was shared the pool currently does not have mastic between the tile and the connecting patio foundation and would need it. I am not ready to start on the project and want to know if this is something I can do myself or if it is worth the money to have a professional do it. I am willing to do it and am not afraid to learn, as I have done several DIY projects around the house already. I have done some research online and have called a few pool stores. From what I can tell it looks as though Deck O Seal seems to be a common item used, but I would like to hear from others as well. Also, in some places there is at least 1.5 inch gap between the pool tile and the concrete patio, from what I have read online, I believe I should put rope in the gap before using the mastic. If this is the case, any recommendations on what type of rope I should use? Any help and advice you can offer is truly appreciated.