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It is quite probably that the solvents used in All Clear are quite likely to damage the cellulose acetate. All Clear will not stick to silicone rubber. I would be inclined to recommend a silicone product such as 'Roof and Gutter':http://www.selleys.com.au/sealants/silicone/roof-gutter/. It will form a stronger bond with less risk of damage to the surfaces.