I have a 21 year old in ground, concrete pool. I had the entire pool refinished about ten years ago after the tiles fell off. The pool has a flagstone coping with an automatic cover with a track attached to the underside of the coping. Now the same problem with the tiles has recurred. I have two rows of 4x4 tiles. The top row is completely gone and the bottom row has a few tiles missing. I talked to a pool contractor about replacing the tiles. He told me that the pool surface itself is fine but I need to replace the coping as well as the tile since water is getting in around the back of the coping and causing the tiles to come loose. If I go this route I would be facing a very expensive job which would be made worse since it would make sense to replace the cover at the same time. I am considering selling the house next year and would like an unbiased opinion about whether I need to do such an extensive repair. The coping is solidly attached. I would prefer to drain the pool, replace the tiles and re-grout the existing coping and call it a day. My question is whether such a cosmetic repair is a reasonable approach. It seems to me to make more sense to fix the tile and do a more extensive repair later when the whole pool needs to be done. On the other hand, if it is difficult or impossible to effectively re-grout the in place coping and the tiles will start falling off immediately then I wouldn't want to take the cheap route. Does anyone have any thoughts on this situation?