I was trying to assist on Eribafolk FB regarding which waterproof product to use on the poptop. I recommend 303 Fabric guard as it's made from Sunbrella. However it was suggested that during the 1980/90s they used canvas and Fabsil can be used.
I never knew they used canvas for a few years, if this is the case I would assume it will be very difficult to identity in order to use the right product?