Waterproofing your canvas

[AMacA]

Folks,

I'm looking for some recommendations for waterproofing a canvas marquee. A bit of Googling suggests Grangers Fabsil, Nikwax cotton proof or Storm Canvas Waterproofing.

Anyone used any of these with good results? I've seen mixed reviews for Thomsons Waterseal, so I think I'll avoid it.

Cheers!

[AMacA]

Thanks for the replies folks, 15 litres of Fabsil ordered up. Hopefully no need for umbrellas inside the marquee at our youth group's summer camp this year!