Slippy Sinylon

Gossamer Gear thinlight works for me. Adds a layer of puncture resistance too. You don't need it under the whole mat, I use about 2 ft. Stops all movement.
http://www.gossamergear.com/cgi-bin/gossamergear/thinlight.html

You can paint on some strips of silicone but it never made much difference to me.

Didnt really want to take any extra weight.. and now as you imply it seems silicon is the only answer, can anyone else speak of how good/bad they found this method for adding grip?

I have sil dotted my MLD Bug Bivy and it made a lot of difference….I now no longer find myself sliding out of the tent…

Did you use the Silicon neat or watered down with meths like when you seam seal? I would have thought neat as it will be tackier, but perhaps this will be too tacky?

I have painted stripes across the floor of one tent (Tarptent Double Rainbow), and performed the "Jim Wood" (jwbasecamp.com) sil-nylon treatment on another (Tarptent Squall). Both methods work well. In both cases I used plain old silicone sealant (like GE II) diluted with mineral spirits. On the DR I just painted some brush width stripes in lines across the floor. I think I did maybe 4 – 5 lines in all.

For the Squall I mixed up the slurry in a 4:1 ratio (4 parts of low odor mineral spirits to 1 part of silicone sealant) and did the whole floor. I think I like the Squall floor better just because whole thing is tacky, and there are no slippery spots. The one downside to doing the whole floor is that small debris does tend to get stuck to it easier. Turning the tent inside out and shaking after its taken down seems to get everything off though.

On a side note, I also did the Squall canopy with about a 4:1 ratio to try to get rid of the misting problem. It resolved the misting issue. The treatment to the floor and canopy added somewhere around 2 oz total to the shelter.

Thanks Matthew, I like that link a lot and I think I'll do the whole floor tomorrow morning.

Best,

Paul