What is the best way to prep a frame for por-15?

[Jaredchevyk20]

Hi, so in the near future I will be coating my frame with por-15. I have read mixed reviews about por. Some say it peels off and some say it works amazing! Now my question is what is the best way to roughen up the surface of the frame for the por to stick? Would sandblasting be the best way? or would sanding it with 80 grit or lower after wire wheeling it and getting all of the factory paint off of it. Let me know you guys experience with it. Thanks