Once upon a time, the wash in stuff was approved by Gore-Tex to be used. According to Kokatat, it is no longer approved/suggested for washing in. Only the spray ON types are recommended now by Gore. Perhaps the bottle you have is old. What I was told is that the wash in kind blocks the channels for water to get out... something like that.
Personally I have never needed to use the 'revive' products and choose to low heat iron the material instead. This brings the DWR (durable water repellent) back to the surface and it will bead up again. On an old personal suit, I would do it ever fall and it would be good for the rest of the winter.
The Kayak Wing
Touring Kayak Paddles
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