I had my frame and a bunch of brackets powder coated.
First they were sandblasted: http://rides.webshots.com/photo/2858777480080251109QvHMaJ

Then coated: http://rides.webshots.com/photo/2606792970080251109wxkOTl

I would advise you to clean every speck of grease off the frame before sending it to the blaster (or blasting it yourself)
Also look the entire frame over many times, on different days, looking for any imperfections. You have to fix everything before it's coated, or live with it once it's done. Don't get in a rush, take the time to replace the broken rivets, weld the cracks and gouges, and knock out the dents all before you get it coated.

I was not told to break sharp edges. But the nature of the powdercoat is it does not want to cover outside corners or inside cracks/corners. Even so my frame was very nicely coated, could be some folks do a better job than others.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-