So - fleaBag the 400 has nice shiny undented springcans.

BUT...
The seam down the tube is not sealed at all. It's just a simple overlap with about half a dozen spotwelds holding it closed. I've not put any oil in there - once they're fitted - but just the oil from the springs etc has caused nice runny streaks to run down the outside from virtually the full length of the seam.
To seal or not to seal?
If so, with what? Seam sealer? Mastic?