I guess aussie millimeters are bigger than ours. The slime product I am familiar with has black chunks of rubber in it that can be as big as 2 mm. The other day, filling a new tube, It would barely go into the tube since it had a narrow valve stem, about 2mm. I tend to run a thick tube, or a tire protector inside too, to deal with goatheads and maybe even glass cuts. It works great on mesquite thorns, that are as thick and long as a finish nail, like a 6 penny nail, or an 18 guage in gun nails and staples. I pull out several that penetrate at least an inch, on virtually every dirt ride in the area I go to 1/2 mile from my house. But on bike tires, the shit may let too much air out before a chunk gets lodged in the hole. With a car or truck tire, you only lose maybe 1 psi, but with a bike you might lose 30 psi. Maybe the stuff I use is aimed at 4x4's and is different. It sure does suck to get it all over you though.