Use Dicor as your base caulk - it is extremely flexible. Self leveling may be appropriate on horizontal surface. But it really does run, you will not be able to use it on vertical service. See DicorProducts.com When you need black, use Dap 230, or Loctite polyseamseal black. Have a small roll of Dicor's EPDM tape handy. Wash first, Dove. Remove loose caulk with a plastic putty knife. OK to caulk over good caulk - rub down first with alcohol. And you're'right, it is a big job.
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