I was going to go with some RTV that I used for securing small plastic parts on my motorcycle but I opted for the GE Advanced Silicone. I will leave updates as time goes by as to how well it works.
The silicone will probably be OK but you have to be careful with it around electrical circuits if it is of the type that outgasses acetic acid during the cure (that strong vinegar smell you get while it is curing).
Acetic acid is corrosive to copper, zinc, brass, etc. which are materials often used in various electrical connectors and switches. Once cured, it isn't a problem but what you want to avoid is a situation where the fumes from acetic acid will be trapped and contained around electrical contacts, unprotected circuit board traces, etc.
07/31/2023: New firmware updates are available.
05/31/2023: New firmware updates are available.
05/18/2023: New firmware updates are available.
04/20/2023: New firmware version 1.4.1 is available for EOS R3
03/30/2023: New firmware updates are available.
2/07/2023: New product announcements!EOS R8 EOS R50RF-S55-210mm F5-7.1 IS STMRF24-50mm F4.5-6.3 IS STMRF15-30mm F4.5-6.3 IS STM