The Holts tyre weld is much better belive me
The Continental kit that comes as standard is ****! If you have a puncture and use the "Gunge" supplied then that tyre is then useless, it can't be repaired aterwards, where as with the Holts kit it can be washed out and repaired, if it's repairable
The only good thing about the Continental kit is that you get a 12v compressor with it so you can top a tyre up if you have a slow puncture