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When I first bought my car I noticed a little discoloration at the top of the passenger door just below the weatherstrip.
Over time, the clear coat peeled until a 6x6 inch square had peeled.
I took it in to get it repainted and they told me the door had once been repainted and they masked the weather strip instead of removing it which left a lip of clearcoat that started to peel. These guys did the job right and removed the weatherstrip, painted over the top and put on a new weatherstrip.
If you ever need a door repainted, make sure they don't take the easy way out but do the job right. It cost me $300.00 for the redo that should never have been needed.
Its called "briding" the problem here is the clear bridged but not the base coat? Both the base and the clear had the same masking but only the clear had a problem? Doesn't make sence. The base coat is a lot thicker than a clear coat. The base coat is called base maker. A proper mask is just as good as pulling the weather strip. Most common problem with the clear coat is not applying it soon enough after the base coat, if you wait to long you have an adhesion problem. Also the wet sand and rub out will take its toll on the clear coat. Of course it is still some what better to remove as much as possible before paint.
The show finish of a clear coat is the worst thing that ever happened to automotive finishs. Clear has no UV filters and it traps the energy of the sun the same as a car with closed windows does. Over time this radiation destroys the clear coat.
You can see this on most car.