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The silicone that I used was Selleys Wet Area Silicone sealant (white). Each silicone layer was about 7mm thick; giving 5mm rubber, 2 lots of 7mm silicone and another 5mm rubber. Total thickness was about 25mm. I let each layer of silicone dry for 24-48 hr with cling wrap on, and it dried fully.
Hope that helps
Allan
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