I Winterized ............. but then this happened.

lenr wrote:
Put on plastic gloves and wipe Vasoline all over the seal. This is approved and recommended by Dometic. Dometic is also an easy seal change.

If that is an approved solution by Dometic it must be new. I have always been told to not use any petroleum product on the seal. Plumbers silicone was the correct answer from everything I've ever been told. Please post where Dometic states this as I can't find it.