I've just got one of these and from past experience I know that they do leak over time. How can I best waterproof it properly? It is all plastic of course and so fixing is the main issue. Shed felt is a no-no, I presume.
I don't think they leak, (I've got 3 and had them over 5 years with no leak issues), however I do think they can suffer from condensation which people mistake for leaks.
You could try a dry granule de-humidifier and see if that helps to keep it dry inside.
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