Thanks everybody-all valid points, and I had not thought of wrapping it!
I mentioned Alfa rosso or 8c red in first post, as if I do it it, I will keep it red and it will still be correct on the logbook.
Common sense would say sell it and buy one in the right colour-red or blue for me-but what's the chances of finding a V6 rosso, or blue example with less than 45.000 on the clock (What I have got now).
Im guessing on mine being worth 5k ish, and I would sell for a sub 50,000 miler in my preferred colour plus a few thousand, but I really can't see one coming for sale-that is until the day I pick it from the paintshop!:
August 2015 I sold a beautiful 52,000 mile Zoe Yellow V6 Spider for £9k, no upgrades other than a sports rear exhaust section, it took less than 1 week to sell. I'd ask at least £10k for that car today.
I currently have, & have had for a while a Proteo Red V6 Spider, with lots of good upgrades but paintwork's showing typical signs of age, so I've stated in the ad that I'd repaint at a cost....even in Alfa 8C.
Proteo is close enough to 8C red to not have to paint the door shuts or under the bonnet, plenty of cars have slightly diiferent, or non gloss, finishes under the bonnet etc.
I'd paint it any colour you want, as long as it's a good job it will only add to the car's current value, which is more than you think anyway.
8C red is an expensive paint to buy but it'll work out a lot cheaper than having to do a full colour change properly.
Proteo Red in good condition/new is a lovely colour, it just needs polishing.
On close inspection, wrapping normally looks cr*p....unless you pay a fortune & I'm still not convinced.