friend taught me to do general preventive maintenance on these vacuum diaphragms and rubber boots using the Armoural and I'm sure it works to extend the useful life of these synthetics by keeping them more soft and pliable... that is if one doesn't get too carried away and vigorously work or flex these old parts. I could see your neoprene based cement being used as soon as you detect any cracking of diaphragms or rubber boots on the shafts... and if so I would want to make a concerted effort to clean off the surfaces very well before applying the special cement layers. The soap/water and then alcohol and finally drying should do the trick.

Regardless, your use of the neoprene wetsuit cement is key to this unique repair technique and it was GOOD that you documented this technique and put into the archives of this MercedesShop forum WebSite.

Best regards,
Sam