I have found that Aerospace 303, or 303 Protectant ...or whatever they want to call themselves in different markets does a good job of keeping (silicone) rubber supple over an extended period.
Cleaning the rubber with IPA and following up with a rub down with a fine grit sandpaper will help before applying the 303.
Hope this helps.
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Last edited by BaroqueMoon; 12th June 2019 at 09:09..
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