NickXX said:The 'texture' on the inside of the wheel arch are normal. I think it is a thick layer of textured paint. However the ones in the pics above show bubbling and flaking - I assume there has been some sort of damage to the arch, probably minor, in the past.
This is what I was getting at! it's smooth but the OPs pics show his to be very flaky/bubbly which does not look normal at all :S