Today I made my 99 NB winterproof and found out that both longitudinal beams have rust in the front area. Although it was completely hollow-space-conserved with a certificate nine years ago and was allegedly treated with fluid film every year. Had an experienced mechanic with him, who also has experience in body construction. He meant generously cut out, stable sheet metal pure, paint and then properly seal. Of course before the carrier flood properly, who his time calculation six hours +-2 hours. Is this realistic and TÜV technically permissible at all? So that it doesn’t rust any further over the winter, I treated it properly from inside and outside with fluid film and it is now in the dry garage. Thanks for your assessment! PS: what I don’t understand is, he clapped neatly on it with a hammer and a grain, but he couldn’t get through. Why is that? Actually, inside is already through If it’s not even visible on the outside…