I recently purchased a new driver's side door for my 87' LX. I decided to try and save some money and prime it myself. I had never prepped an already painted car, and I believe I sanded it too much. Anyway, the reputable body shop I went to told me they couldn't do the job. I haven't yet extracted all the details as to why not, but I will post that later. I will also post a picture but if anyone has any suggestions based on this information, it would be very helpful.