Condensation or leak issue?

[KBM]

I have recently had a leak in a weld behind a taillight which is now sealed (-a good few weeks ago now) But I am still finding water in the car in small amounts (photo with red circle) and also flowing from the inside of the top of a rear side door panel downwards towards a wheel arch. (Pictures might explain this better than I can) what could be causing this please and any advice? Is this minor condensation or something with air con etc. I have had a garage drench the car to be unable to find a leak but this sporadically happens. Ta

 

[Sparky2018]

Probably a condensation issue but might be from higher up. Was looking at the inner arch on mine next to the fuel cap and this area is starting to corrode its pretty much same area but 3 door model.
Once I get chance I will remove my interior carpet at side and the trim as I need to figure out if its going to be something I'm able to tackle.
maybe just needing to change out the fuel filler cap and tidy up the arch in my case.
You should check this area from the outside and see if it has similar issue.

my problem water inside was caused by the boot switch surround but was quickly sealed after the switch was replaced it was dripping down into the wheel well last year

 

[novocaine]

your boot slam panel looks black. have you painted it or has the car been in a rear end at some point and had it replaced?

if it is black and you haven't painted it I'm afraid it's the latter. given that they haven't bothered to paint their I'd question the job and suggest it's a leak on a seam somewhere in the roof area or high on the upstand.

chuck talc on the space, wet car and look for the run and where it's coming from.

 

[KBM]

Thanks both

If you mean the thin panel on the left of the light I think it’s the lighting as it’s not black , now checked over twice my mechanics and can’t find an obvious leak.