"Fabsil" is a fabric waterproofing product in liquid form, you can buy it in 5l tins from a major camping shop.
I have a tin that I have used on my tents, works extremely well & can either be brushed, sprayed or applied with a cloth.
I did my 6 berth frame tent with it in the local scout hut, didn't know there was a playgroup the next day as I'd left it there.. oops
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