I'm a new pool owner and have been reading through this forum for months (thank you for all your info!) as we prepared to get a new liner and open our pool this spring...new liner is going in today! Anyway, I cleaned the skimmers last night and noticed a crack on the bottom but what it really looks like is a gap in caulk or silicone at the 8:00 position. Is there typically a bead of caulk around the perimeter? If so, what kind of caulk/silicone should I use to close this up prior to filling the pool?