It was designed for the sealing strip that comes with it, however silicone will work and is generally considered suitable for the purpose. Its just that it can be a bit messy if you havent mastered the art of using the gun
i use to use silicone for wastes...now i favour plumbers mait..
it is sometimes messy but if you get a leak u can normally just tighten it up a bid more and its sorted....however with silicone, whens gone off ur buggered if u want to tighten it some more
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