No fast fix for this sorry to say, but it can be done. , You need to remove any loose rust and undrseal you can get at, treat with a rust converter and overpaint with Buzzweld RPC. Then re apply underseal in the areas you have removed it and spray the complete underside with black waxoyl. Treat any box sections internally with dinatrol, takes about 4 cans on a Jimny.
This of course is after you have patched any rot holes. For a nice surprise have a look at the front body mounts under the front wheel arch liners, if you are lucky it will not need welding. It took me two weeks to treat our Jimny, but its now 100% rust free underneath and protected.
This is just my way of doing things, but we all appear to agree that Buzzweld is good stuff and the Jimny rusts :lol:
Yokohama Geolanders, Sony head unit, NAUTILUS Air Horn, DRL conversion, Rear cargo space, Elvis Bobblehead, transfer Guard, Indian hanging Elephant, Koni Heavy track dampers, Custom SS exhaust, Voodoo Doll, Adventure Rack with LED ight bar, vintage ERIBA caravan usually attached (yes it's slow)
