Well, I'd really recommend something in the middle (having tried all kinds of thicknesses). So I find green / med to be perfect. It runs but not too much... a bit too much squeeze/tilt with the pink one and your fingeres are glued on the tire as well...
I've tried to thin with acetone, and it gets thinner... but the glue just doesen't seem to work as well then. The acetone is more for de-bonding, so I guess it messes up some of the glue's curing abilites.
What you can do is mix that thick one with a very thin one, you'll then get this IMHO perfect medium thickness
