So I searched but didn’t find anything that covered this. I found out that the silicone is applied in a pressurized bath during the manufacturing process which sounds to be a good way to make water resistance durable for the lifetime of the fabric design. But I’m lacking in fabric knowledge.

How long does the water resistance of the fabric last?

I’m assuming water resistance will last many years until the fabric shows signs of needing replacement due to normal wear from UV and other weather elements.

Does anyone find a need to retreat annually with something like Nikwax?