Hoping for some advice here guys. After buying a tin of cheap underbody seal a few people have mentioned its probably not the best out there as if it chips it likely to hold any water that may ingress between the coating and the metal.
Mactic 121 seems a popluar choice although a few stockists seem to be funny about posting to n.ireland or seem keen on andding extra tax's to the final bill!!
I've looked at some of the 3M stuff as there is a 3M supplier not far from here, has anybody any experience with this stuff or should I bite the bullit and go fro the 121??

http://solutions.3m.com/wps/portal/3...beDCH9W13WN4gl