Originally Posted by
Jadesfire
In addition to the above, I wiped the whole frame down with alcohol (mineral spirits would work, too) and let air dry before applying the primer. I read on Sheldon's site that this step can help remove any oils that have been transferred from your hands to the frame, which might impact the paint adherence. Possibly this is unnecessary, but it has done no harm to the one frame so far that I have done.
One caution to add is when using a prep cleaner (my preference is "prep-sol") be sure to wear gloves to prevent skin oils and fingerprinting that always seems to haunt later when spraying.