Do you have your favourite make of silcone or do you just use what you can get your hands on at the time.....
I like to use bal micro-seal.......
BAL Microseal
A unique, high performance, waterproof and mould-resistant silicone sealant especially formulated with built in Microban® antibacterial protection, to inhibit the growth of black mould and bacteria, such as Listeria, Salmonella and E-Coli. For interior and exterior use. Bonds to glass, ceramic, acrylic, fibreglass and glazed or painted surfaces.