Club 80-90 Forums

http://www.club80-90.co.uk/wiki/index.p ... Glass_Rust

Have a look here on the WIKI, it might help, good luck, there is no magical everlasting cure to seams. sorry.

I removed the backs off the units to expose the horrors behind, depends on the conversion but the backs weren't very well attatched on mine, also the trim panels could be unscrewed and bent back to get access. Initialy wire brushed the worst of it off, then possibly dremmel with mini angle grinder, then hoover out the rust dust. I then used clear waxoyl, I Used the aerosol and hand pumped versions depending on the difficulty of access, but I'm sure a compressor would be better. Check behind your fridge esp the vents, the voids bellow the rear vents in the engine bay, and remove the breather tanks in the front wheel arches and check behind, as these are notorious rot points (you may wish you'd never looked!)
wiki'd

remember RE then wax! RE is supposed to go straight on rust so dont pretreat apart from clean