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Sounds to me like cracks in the seams/paint due to normal body flexing. Perhaps the normal flexible sealer has not been applied under the paint on these seams allowing moisture to get into the welds. Then again, the bodywork should be "galavanised". Not sure if the Clio shells are hot dip galvanised after welding or the panels are treated prior to manuafacture. If the later, heat stress during welding could still induce rust if moisture gets into the seams. If you have any pictures we can keep an eye on our cars for the same problem.
Hi viceroy, Those definately look like cracks in the seam sealer under the paint covering the welded joint. Couldnt quite make out which part of the boot/roof body this is from your photo ....a bit too close. Do you have a picture with a wider view?
Has the car ever had rear end accident damage in the past? This may be due to long term stresses from previous repairs?