I use 1Z Gummi for most stuff. It does fine in most applications. For moderate to severvely damaged rubber, I use the BMW Gummpfledge. It's amazing. Unfortunately, I'm down to my last 1/2 tube and they haven't made it in nearly 10 years. UGH!
I haven't noticed anything going on with my rubber surrounds yet...only 2 months old though.
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