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Old 8th September 2020
Lives for gear

As long as it stays soft over time, the joint is around 20-25% flexible it would serve the purpose. Hardness after curing 35-50 Shore A is OK. If elangation at break is mentioned instead of Shore A in a data sheet, something like 400-600% should be OK. Higher strength isn't reallly what you are looking for, these are usually less flexible.

I like MS polymers, they have no foul smell, are non toxic and are paintable, also resistant versus UV / sunlight and come in a variety of of hardnesses / strengths. (Silicone is not paintable and polyurethane may degrade over time in sunlight.) There are many different brands, shouldn't be a problem to find something in GB / Ireland. Some different types of sealants: