Ive had limited experience with snakes but there are one or two things to look out for.
Firstly in terms of doing airwraps/hyperloops you will face problems if the rope is too thick, i made some with 1" rope with knots in each end and they arnt flexible enough to do wraps with. I'd recommend using thinner ropes with monkey fists or some other knot at the end. Not spun them myself but chutneys new ones look very nice. They dont have flaming handles though (although they are counterbalanced for throws/contact stuff).
You can buy kevlar sleeves from somewhere like this
http://www.bunzlsws.com/search.aspx?search=sleeves although I cant say ive used them myself yet. Pretty sure dunc used to have some so he might know more. Would have thought they are ok for wraps and a bit of contact but with prolonged contact with fire they would get pretty hot.
I bought my gloves from lakeland (
http://www.lakeland.co.uk/product.aspx/!1800_10774 ), I know Guy (lazyangel) uses these as well for his snakes and for catches with normal fire poi. If you really need to wet them to stop your hands getting too hot I think youve got problems anyway so I wouldnt bother. If its too hot to hold without wetting them the water will only delay the inevitable and as mentioned you may have additional problems of steam. Not sure how they would perform if you were going to hold anything long term that is on fire though. I think it would be pretty difficult to find something you could do that with that isnt very restrictive to movement either, let me know if you do!
Hope this helps
Motley