Maybe use Swissvax Gum Feed:
Let’s get it right: As rubber becomes brittle, cracked and unsightly over the years, regular care of all rubber parts is crucial. Swissvax Gum Feed was developed exclusively for rubber and keeps rubber seals pliable for years. Even hardened seals become soft and flexible again after several applications. And it also reliably prevents seals from freezing on in the winter.
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