If it is in poor condition, I recommend removing the old sealant first using a heat gun and a plastic putty knife (carefully). As others said, dicor self leveling sealant is the correct product to use. Also, it would be good to clean the areas very well with a scrub brush and detergent, careful not to let water into and gaps in the sealant. I would also wipe down all areas with acetone on a rag.
If you want the joint to remain sealed for a long time, I recommend Eternabond tape for the front and rear seams in lieu of the Dicor caulk. More expensivebut worth the peace of mind.
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