In reply to ceri:
> (In reply to Ben Sharp) Nikwx is a company not a product. They do various waterproofing products which do make various things waterproof and these are generally fabric specific, although we ahve used cottonproof on non-cotton fabrics and it seemed to work fine!
Selling the stuff on a daily basis I am aware that nikwax is a company, hence why I specified in my response that I made the assumption the OP was talking about TXDirect; they didn't make it clear what particular product they were requesting information on but TXD being the most used fabric waterproofing of their range it seemed like a reasonably safe assumption to make.
No Nikwax waterproofing makes fabric waterproof, it's adds a water repellency to the fabric. To test this, treat any non-waterproof fabric with any of the Nikwax range and fire a hose at it.