Do you bother joining them before attaching to the wall?
There will be some discrepancy when drilling, plugging and screwing so they'll not line up 100%, just wondered if people tend to screw them together or something?
In my house, where I have replaced skirtings, the second one is cut to fit the first one fitted and they are glued on (No More Nails or similar), top edge on plaster and lower edge, with packers, on the brick.
That's fine on internal corners but not *external* corners.
I mitre mine and then glue them to the walls.I fill any slights gaps between the mitres with decorators' caulk and then sand them before painting.
Yes, join them with "Mitre Fast" (or similar) before fixing to the wall. I've just been replacing the skirting in quite a large central area with lots of ins and outs (and a curved section!) - many scribe and mitre joints. When going round a "sticky out bit" I've found it difficult to get the mitres spot-on at each end of a run because of small errors bisecting the angle and because the returns sometimes turn more than ninety degrees - in those cases I glue one return, fix the skirting and then attach the other return.
There are mitre boxes that you put on the external corner that go on both walls, fix the angle and then use it to mitre the skirting boards to get the angle perfect.
I have just done some skirting, and I just butted them. With the end grain filled and a couple of coats of paint it's good enough.
I did have the mitre saw set up, and I could have mitred it, but it just seemed too much faff.
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