rwthomas1
Site Supporter
If the corrosion was wildly over estimated I would think the MOT could be contested? Dunno how it works there, are the inspections performed by a Govt entity or a Govt licensed garage? Can you just take it to another shop? Either way I'd check the swingarm carefully. If its serviceable prep and paint it with good quality paint. I wouldn't be concerned with future welding. I'd be absolutely soaking that internal cavity with a rust preventing product like Waxoyl, PB Blaster Surface Shield, etc. to make sure any corrosion is stopped. No way is any kind of paint going to stick in a closed cavity that is already corroded.