Glyn - my thoughts:
A GRP body is never, ever as stable as metal. They move, and the majority of movement occurs in the first year of being mounted to the chassis.
Also you will get things like boot/bonnet panels being "pinched" by the latch handles, possible reactions in the grp from adhesives on the underside, shadows where inner wings abut the underside and so on. All of this can be put right (for good) at paint prep stage.
What I did was to build, SVA, drive for a summer, then strip for paint. This allowed the shell to settle, move as it liked, bake in the sun etc. In short, to get the majority of inevitable bodyshell movement out of the way before paint.
I also got a perverse buzz from driving a disgustingly tatty shed around that could fly past just about anything else on the road! I admit I didn't even deflash the shell, nor polish it in any way - that's a job for the pro's (the painters). The only thing I got was being ignored at shows by the uninformed, since the thing looked so naff!
By doing this, I shall end up with a painted body that will look better for longer.
On the flip side, many folks paint during build. I was worried about this anyway, as you will inevitably make mistakes making openings for roll bars, windscreens etc - far more difficult to correct when painted, but many folks do it that way. I was also sh*t scared of scratching a fully painted body shell as I wandered around it with spanners/hammers/chisels/drills etc!! And boy did I scratch it 'cos I didn't care - made for a much more relaxed build.
The downside is the work involved in stripping it down for paint - interior out, all lights off, dash out, tank out etc. It took me 3 days of not particularly hard work, being as I had made allowances for it during the initial build, with interior panels held in with velcro, carpets not glued etc.The Crendon also helps in this respect with easily removable dash (two nuts, four multiplugs, plus instrument lines) etc.
I guess by now you have realised my preference to your question???
Wilf
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