Holts Tyreweld Puncture Sealant Emergency Tyre Repair Foam Car Puncture Repair Kit Sealant, Quick & Easy Flat Tyre Foam, Drive Up To 100 Miles, No Tools Needed Unscented, 400ml, Pack of 1

Always works, just when you need it! I've used others, but nothing gives me confidence like Holts!

Tldr; Does the job for small, slow leaks. 3-4day = 1.5-2bar loss. I had a very small leak on a 18 inch tyre, I chose the medium as the tyre was low profile-ish, so the volume within was reduced. It was so small I couldn't identify the leak area, and the tyre held workable pressure for 3-4 days. With tyre pressure at around 1.5bar, I used the entire can as instructed, this brought the tyre to about 2.4bar. I topped it up to about 3bar, thinking I'd loose a little pressure before it sealed. However, as the can is aerosol, it cools when in use, so expands when warms. This happens when you drive as the tyre gets warm, and so I ended up with a tyre pressure the next day of above 4bar steady. It had sealed quickly and increased pressure. I vented the tyre back to normal pressure, and haven't had a problem since. It's held up for two months+. Would recommend for small leaks. I would think anything like a nail would require a plug repair. And if on tyre wall, the tyre has to be replaced. But, it may save you in a pinch for again, small, slow leaks. If your tyre looses pressure within 12hr period, I'd say this is 50/50. Above that and you've got a good chance. Below that and the leak is too fast, indicating a larger hole in the tyre. I don't often recommend must haves as everyones requirements and abilities are different. But this works well for what it was designed for, it's relatively cheap, lasts a while in storage, and is the size of a can of hairspray.

Contents went everywhere, what a mess!

Like a fire extinguisher I will use it only in emergency so cannot tell if it is going to be any good. I hope so! Will be able to report more after use.

Gut