"Testicular fortitude"
Honestly, there are multiple reasons for not driving this car in the rain. I think it might be impossible to make a clubman estate not fill with water.

Well, possible if you keep it out of the rain, soo

I've driven it to MOT (TÜV) last december at 0°C in wet conditions. That was fun.
Tin, yes, hmm. Still not sure if using it was the right way to go, but I'd like to think of myself as oldschool... Also, it's something everyone says is "so hard to do". That's where I get triggered and have to prove them wrong.

This epoxy stuff is great to work with, but I didn't know that until after its use. Oh well..
Well, the rear is painted now. I'm happy with the result, although there are some bad runs from the paint. I probably used too fine grit when sanding before. 2500 is not a good idea, when you plan on sticking paint to it. Kinda embarassing, but hey.. The one who doesn't make mistakes, doesn't work at all.

Will need some more work cutting away the runs and sanding/polishing unwanted dust inclusions, but at least the basic contours turned out very nice.
And since Fred is so stingy with server space, I'm linking to some videos:
Before paint[/url] (50 MB) (volume / Bob Dylan vinyl warning):
http://couchlock.de/mini/VID_20190914_162109.mp4
After paint[/url] (60 MB):
http://couchlock.de/mini/VID_20190918_110627.mp4