Best non-slip ground cloth?

David,

I have been looking into this as well. I believe the solution that I am going to try for my inner tent is to cover the floor on both sides with a silicone and mineral spirits mixture. I found the link on here but I have misplaced it at the moment. This should make the tent more waterproof and stop my airmat from sliding around. I'll post the link if I can find it. I bring a polycro ground sheet for outside the inner tent now but I have considered one of Suluk46’s padded ground sheets

I coat both sides of my silnylon tent floors like this:
http://jwbasecamp.com/Articles/Silnylon1/index.html

It works great with my Exped SynMat UL7, Thermarest Prolite, and the Ridgerest sticks to it like a PostIt note! (Dirt and sand sticks to the floor very well too, but I don't mind.)

Hemming up the edges of this fabric should make a nice, nonslippery ground cloth too:
http://www.questoutfitters.com/coated.html#2.2 OZ. RIPSTOP

(or you could do the same with silnylon and do the treatment above)

I've done that – coat bottom and top of bivy floor – maybe 10:1 ratio though

It got worn off the bottom after a few trips. Next time I won't bother coating the bottom but probably the top surface that my air matt is against I will coat so the matt doesn't slip and so it's waterproof.

Maybe it would work better on a tent floor because on a bivy the abrasion is concentrated on a small area.

But, you don't really need the no-slip on the bottom – the tent floor doesn't slip against the ground which is too rough – you (maybe) need no-slip between air mattress and tent floor.