I did the POR-15 thing...Like any job preparation is the key. POR-15 it is not a paint in the traditional sense and sort of defeats the object of it's adhesion properties if put over existing paint.
Did mine after a little kerb indiscretion
Agree get everything out you can.
A-Frame, and Dedion out (Replaced ) along with ARB (repainted, new drop links) and Radius Arms (replaced), Suspended brakes temporarily from damper upper bolts, Drive shafts out and diff holes taped over, boot floor out and fuel tank lifted by straps from Cage/FIA bar rather than removing.
Cleaned as much as I could back to bare metal, masked bulkhead and the blue bits, Metal ready primer, POR-15 then Chassis Coat black. Rebuilt using all new bolts. Preparation took a verylong time (and in a single garage). Only thing I should have done was send diff to get overhauled while had good access.
Still looks great nearly 2 years on.