I would concur with using the Henry's 887 TropiCool 100% silicone after sealing cracks and seams as needed with the Henry's 884 caulk-type 100% silicone tube sealant. After extensive conversations with Henry's customer service reps, I was informed that it is not normally necessary to remove old sealant or dicor. After thorough cleaning using TSP or Simple Green (will NOT leave residue like Dawn dish washing soap), apply the Henry 884 over cracks and gaps, let cure per label directions, and top-off with the thick liquid 887. I just did mine and very happy with results. Lots of work, but saved lots of money, too.
