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The Tent Sure reapplies the urethane coating or whatever. So in theory it rebuilds the waterproof barrier. That's the theory anyway.For the jacket, it probably just needs a DWR reapplied (assuming it's probably a 3 layer fabric and the membrane is still good). Atsko Permanent Water Guard is my fav. Revivex is easier application but more pricey and not quite as effective. Wash first in a non-detergent wash (Sport Wash is great, also from Atsko...and use it whenever you wash anything with a DWR. Detergents just wash it off).
IIRC Golite used a 15d silnylon that had a light urethane coating. Urethane coatings wear out and it wasn't a heavy enough sil impregnation to stand on its own so it's probably toast.