This product ignificantly improves the performance of cotton clothing and gear that typically offer minimal protection from the elements. It can be washed-in, brushed-on or sprayed-on, and treated items dry remarkably fast. The effect lasts for several washings.
SUMMARY: Nikwax Cotton Proof was subjected to a pretty demanding test, probably far greater than what it's designed for (tents, jackets) and it performed superbly. I was genuinely impressed by how much better than I thought it would be that it actually was. I'll be looking to test some of Nikwax's other proofers in the future. ALSO FOR USE ON COTTON/POLYCOTTON TENT MATERIALS!
Read the full review here:
http://www.gearweare.com/2010/09/video-review-nikwax-cotton-proof.html