Hi Tahr,
it has probably been noted by other members that i fall into the Nikwax category (quite heavily). Although i am in no way connected to the company or any retailer that sells the stuff, i use Nikwax on more or less every bit of outdoor kit i own (and some others

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I have used Grangers in the past but i found that the Nikwax stuff seems to be more reliable and environmentally friendly. My cotton smock's are a favourite, i always use cotton proof (or TX-10 as it used to be known) and tech wash on them and the trousers. I did a week long outdoor stint in Feb for instance. It bucketed down and blew a gale and when i say a week outdoors, it really was a week outdoors. Bivvying under a tarp was as close to indoor's as i got. Any road up, i used my Nikwax proofed cotton gear (smock, trousers, jungle hat etc) and my Nikwax proofed non-goretex leather boots all week and not once did i feel the need to drag out my goretex clothing. It really can be that good. If you apply it right and maintain it with tech wash, you will not regret it.
Personally, if it is a first application, i initially wash the clothing in a 40deg cotton cycle with no detergent, followed by a 40deg cycle with tech wash, followed by three 40deg cycles with Cotton proof, then hang to dry. After that, if it requires a wash i'll tech wash it and the cotton proof it once afterwards. It might sound a bit of a fuss, but i find this works if you want to get a good proofing from the off. To be honest, i should by rights get a christmas card from Nikwax!

I use Gearproof on my bergan and daysack, Fleeceproof on my fleeces, Gloveproof on my gloves, Aqueous wax on my boots, and the spray on stuff, name escapes me for the moment, on my Buffalo Mountain shirt and Snugpak Softy. I even use their saddlery spray on my dog's collars!
Try both, see what you think, my opinion through experience is pretty straight forward.
