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I would strongly recommend using a neutral cure sealant, rather than an acidic cure type. Little or no difference in cost, but there would be no possibility of corrosion, whereas the acetic acid types can cause corrosion. If I was doing it myself, I would use a polyurethane sealant such as Sikaflex. It'll cost about twice as much as the silicon sealant, but is an excellent product. Bojan mentions that you must be sure that it will cure properly, and that is a major consideration, use only a fresh tube, and do a test first. If you buy from a major store, you will be pretty sure of getting a fresh tube, as there will be a high turnover, whereas a corner store may have old stock, and that could lead to problems, as it will only have a shelf life (in the tube) of 9-12 months, or less if it hasn't been kept at reasonable temperatures.
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