WelshGas
Retired after 42 yrs and enjoying Life.
Super Poster
Lifetime VIP Member
My original, now 10yrs old, bellows has never leaked and has never been treated.I have said a few times that mine does not leak and is the dark grey outside, cream inside fabric.
It's possible that it does not leak as I have sprayed all the seams and zips with Aqua Tex which is marketed by Isabella for reproofing their very expensive caravan awnings.
I have done the seams inside and outside and it does not leave any stains / marks once it is dry.
All tents, awnings, poptops need reproofing every 12 months.