All the painters that I've spoken to (Including Rhino Shield....whom I'm not going to use) have advocated leaving the non-damaged paint in place and priming and painting over it.

*dazed and confused*

Help me here--->First assumption check: Doesn't the adherence of new paint depend upon the adherence of the first layer? If so, doesn't that just make the new primer & paint fall off on the old paints "schedule"?