I was washing my rex last night and I accidentally knocked off the little black plastic bit above the side skirt on the rear passenger door.
What sort of stuff will I need to stick it back on?

The car had been damaged before I brought it and it appears that the repair job was not to crash hot. You may notice the little black tech screw holding on the skirt.






Is the black/brown stuff on the back of the black plastic thing bog or something? Its on the car body too.
I was thinking i'll scrape it all off and start again.
Can any one please recommend a good adhesive for plastic to metal?

Thanks heaps,
Will