303
has a host of products, including a fabric guard. Aerospace Protectant is the one for gaskets and yes, keep it off the fabric.
OK - then a different 303 product
The only one we ever use is the one for non-fabric products. To be clear, that is what I am talking about above (as are most probably).
303 recommended
I recieved a Stohlquist Dry Top for X-Mas and the care instructions that came with it said to use 303 on the gaskets. You’d like to think they should know!