LIL QIK, I can give you some insight. My car was dipped and e-coated about 3 years ago. All you have to do is strip the car down to a bare shell. You shouldn't have to scrape seam sealer off or do anything else. I had mine done in Michigan and the process was that they baked the car at 600 degrees to burn off all the sealer, paint, filler, etc. Then the car was submerged for a day in the stripper. Afterwards it was taken to a facility to be e-coated. You just can't get anymore thorough then this. If you're interested, here's the contact information for them in case you want to go outside Texas to have this done.
International Paint Stripping
15300 Oakwood Drive
Romulus, MI 48174
734-942-0500
They can strip and e-coat body shells within the measurements of 13.6 feet in length and 48 inches in height. Cost: $2500
I can't say enough about it. It was WELL worth the money. And my car was a Detroit car. Today it looks like a replacement shell from General Motors SPO. See my website below for some pictures.
Hope it helps