I need guidance on refitting the rear arch trim on a 2f coupe. The one that sits beind the bumper. 

 

Recenly the polo needed welding to it's rear arch for it's MOT. The mechanic left it in primer and I completed with spay cans.

 

When I refitted the trim, it was a tight fit and I managed to scratch the paint off down to metal. So I had to repaint.

 

I've given it a week for the paint to fully cure before I attempt again. So I don't take off the paint again, does anyone have any tips for refitting? 

 

is the metalwork the correct shape ? 

 

week old paint shouldnt rub off down to the metal , have you used the correct primer over keyyed up prep work?

The metalwork might not be the correct shape. My second go and the trim doesn't quite fit. I'll contact my mechanic who did the welding and go from there.