Modern Vespa

Slime/Flatout ? Any arguments against?

Repair shops don't like the mess and may charge extra to change a tire with Slime in it.

I've put in my tubes. Haven't got the chance to test it so far.

I guess my reply would apply to tubeless tires. Tubes would probably contain the mess

I can understand that with tubeless tires. I am under the impression that when put in tubes it can prevent a sudden blow-out.

Not that you know of.

Absolutely do not put green slime in Tubeless wheels it actually bubbles the paint and eats the aluminum within a very short time
The inside of my stock 12 inch rims are corroded to the point that it looks like they were in salt air for 25 years
Don't know about any other sealing products except latex we use it in the bicycle industry for Tubeless mountain bike tires with no damage to the anodized aluminum rims
You can purchase it at a good bicycle store, 2oz in each 12 inch rim will do the job

Tubes in a Tubeless wheel will cause a blow out and are very dangerous
Tubeless wheels are much safer because they tend to go flat slower when the tire gets punctured resulting in just a wobbly ride .

I am sorry that I wasn't more specific. I am asking about putting this stuff in tubes, thinking it would slow down the escaping air.

I don't have any experience with scooters, but after my son put slime in his bicycle inner tubes he went from fixing flats every few days to every few months. If he noticed the tyre was soft, he just removed the cause of the puncture, if it was evident, pumped the tyre up, spun the wheel to get the slime to the puncture, and rode off.

The issue I found with any fluid in tyres it that is ages and is an absolute PITA to get rid of.

Also when out somewhere fluid does autorepair most but not all and it is horror to repair on route.
Also you can be unlucky that the tubelessdoes not pop on the rim and seals. Then what?
You'd still need an inner tube and pump.

When cycling in competition is was the thing as lighter but stopped with comp. 2019 and went back to heavier tyres, extra thick inner tubes and a bit higher pressure.
For repairs I carry a spare inner tube and a pump.

On the tubless scoots I carry a foam can.

One of my tubeless tires wouldn't seal on the rim. So I added some orange seal and have had zero issues since.

But what he's talking about is putting it in a tube. Not sure how you'd get it in there. I don't think tubes for scooters have a removable core to get the liquid in there, however if they do, yes it'll work.

They do, or at least the ones I've encountered have done. I've removed the cores to deflate them more quickly in the past.

Yes, it's a Shrader valve and the core screws out.

I had wheel with a slow leak on my lambretta. Added some slime to the tube. Did not notice any difference in handling. No added vibration. It's been 4 years and I've only added air twice.

FYI lots of tires is TL/TT. For example Michelin S83 TL/TT type have note on the side - "Tubeless. On tube type rim use a tube"