theres nothing wrong with them all other countrys use them but us and say its a temp repair .its ok to go round with a screw or nail in your tire for a week till it slowly goes down or blows out but plug it with a sticky string forced in isn'tI am partial to a tyre plug but apparently they are not road legal, I still use them though ,more than good enough for plant and
Bob
I remember the tyre plugs first time round in the sixties, Brilliant bit of kit, Never had any trouble using them,And the plugs were black in those days. Don't even have to remove the wheel, I still have the original Dunlop tin and tools but have had to buy some new plugs and solution, For "emergency" use only.