Usually what you would do is treat it like a touch up, overlapping the loose, dead clear coat with the new clear coat, then wet sand it down. If its really bad, feel free to do some light wetsanding to remove any of the really dead clear around the edges.

Buying a Porter Cable buffer is a solid investment because its one of the few random orbitals that can generate enough heat and power to generate results similar to a rotary buffer without many of the downsides and worries of a rotary buffer. Honestly I wouldn't put my money anywhere else. Cheap buffers are fine for applying a glaze, sealant or wax, but not effective when trying to remove imperfections in your paint such as swirls, scratches, oxidation and water marks.

This is an excellent alternative though to buying a Porter Cable if you plan on continue to do work by hand.

Lake Country Hand Pad Kit

It gives you the ability to use the same type of pads as you would with the Porter Cable and tailor each pad to the job you are doing.

Yellow Cutting Pad for abrasive polishes when you are trying to remove scratches and swirls

White Polishing Pad for finishing polishes to clean up hazing or very light swirls

Blue Finishing Pad for finishing polishes or glazes

Black Finessing Pad to apply a sealant or wax.

Please let me know if you have any other questions.

Sincerely,

George @ Detailed Image