The Graupner props are the only ones that I've ever seen that had a warning about keeping the prop hydrated.

The warning states something along the lines of, if the prop is left in a too dry environment the plastic will dry out and become brittle over time. They advise re-hydrating the props.

This threw me for a loop! I had never heard of anything like this and I'm still wondering about it.

I see no other manufacturer include anything like this in their documentation or warnings.

Any idea as to what this is all about?