[Rob. Smith]

I have done a bit of googling and can't find a Finilec seller in oz. But there two others that you should have a look at. Punch in "Slime" and have a read. Then look up...
Haigh Aust. and in their site look for "Liquid Patch tyre repair" in the side bar. Haig products are available at nearly all auto accessory places.
Both products go into the tyre as a liquid and stay that way until a puncture happens. A bit leaks out and seals the hole and the rest stays liquid till the next puncture. Two immediate downsides. You will need to carry a pump and you won't know if you picked up a nail or what ever. So you'd have to check the tyres regularly for things stuck in the tyre. I've seen other aerosol sealers but can't remember their names. The aerosol ones are good for when you come out to the car in the morning and the tyre is flat.