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Yeah I've seen this. I was just wondering since I'm doing some work on a frame soon but I'm aware things are looking a little orange on the inside already so I need to sort it out before preventing more.
Is acid stripping likely to actually remove any rust?
PhilDAS-
We outsource dipping and get mixed results because there are so many variables.
I'd hate to give any kind of definitive answer because it doesn't really exist. -
If it's just a bit of surface rust, waxoyl or similar should sort it - use a hairdryer to warm the frame tubes and make sure it gets to the extremities. Bob Jackson recommend Dinitrol ML, which comes in an aerosol; you can get an extension hose which makes it easy to get into all the nooks and crannies. Both Waxoyl and Dinitrol seem popular with Land-Rover enthusiasts, so they are both presumably fairly tenacious.
general_greyharbour
Thrustvector
A lot of the framebuilders we work with use this stuff to prevent rust...