Not worth trying. -Just paint over it with a good thick paint like Behr premium.
If it's on drywall, then you cannot remove it.
You will use an oil base primer to prevent moisture from getting in.
It's generally much better to use water base primer on drywall.
If the primer was a water based primer, then you are in trouble. If it was, then you need to strip it down to the metal and use either an oil based primer or I would use a primer made by Rustoleum.
oil based primer and then paint it
You have a contradiction ! - Latex primer CAN NOT BE oil based.
Your ceiling may have been oil based, or really anything other than latex. If you used latex primer over oil then there is really nothing you can do except remove it and get a super low gloss oil base.
Oil based primer is the best bridge between oil and latex paints. If oil based paints are not available in your area, a high adhesion acrylic primer over a well prepared surface will also work.
As long as the surface is clean and dull, then either an oil or acrylic primer can be used to cover oil-based paints.
Absolutly! You just have to check to see if the primer is first an exterior primer and if it will stick to glossy surfaces. You can lightly sand to rough up the surface or just clean the surface and apply the primer. For oil based primers I would recommend Beauti-tone's fast dry oil primer or Zinsser's oil based cover stain primer.
Yes. Oil based primer works over just about any surface.
Yes, if the primer is oil-based too (alkyd is good too)