Nikwax Cotton Proof Fabric Care 1000ml (33.8 fl oz):
CottonProof wash-in or paint-on treatment adds water repellency to cotton, heavyduty canvas and poly-cotton fabrics. It contains a high concentration of active ingredients that make it extremely effective on clothing and gear that typically offer minimum protection from the elements. It works great on everything from barn coats and duffel bags to outdoor clothing and tents. Can be diluted with water and sprayed or painted on wet or dry cotton or canvas tents.