Fenders & doors painting/mounting sequence?

[billjam]

I am preparing a pair of 930 front fenders for my Carrera, which is about to get a colour change as well.
I started to take them back to bare metal inside and out but soon realised that there wasn't much to be gained by removing all the under-body rubbery protection - what is that stuff called?
Anyhow, I have wire buffed this "stuff" from around all the mounting holes and cleaned up the mounting flanges, but it obviously needs to be sprayed on again to seal and protect the whole area once the fender is remounted.
What I am struggling with is the sequence of reassembly and painting primer, top coat and "stuff". My initial plan was to final paint the fenders off the car, but I am beginning to think that it might be better to mount the fenders after primer and then do the top coats.
I also need to recoat the fender lips with "stuff" before painting, so I have to work that in at some point as well.

What is the best sequence for this?

As for doors, I had also planned to strip and repaint the doors off the car, but I have seen threads where it has been done on the car.
What are the pros and cons for doing the doors on the car or off the car?

[wachuko]

Some one else with far better knowledge than me will sure chime in... but, looking at how my guy is doing the RSR... fenders, hood, sunroof, etc. is painted off the car... then, once done (wet sanding, buffing, whatever other magic they do), assembled back with all new seals/gaskets.

[David McLaughlin]

At the shop I work for, we do all of the prep and chassis work with fenders off the car. The chassis will get seam sealer (stuff) and paint. At the same time, the fenders, doors, etc get jambed (sides that don't show). The fenders, lids, doors then get hung on the car and the outside paint is applied. This is especially important with metalics and multi stage paint systems.

[bluemane500]

the best way to refinish the car is in pieces disassembled ,,,check out my website and you will get the idea Leavitt Street Auto Body

[yel911]

Assemble all the panels, make sure the gaps are good, then remove and paint. The doors come off by removing the hindge pins, not the bolts. Good luck!!!