Dicko, I've done several using the Mipa Brand (German) it's a 2 pack spray system...I used the local agent for Mipa (he's an ex spray painter - APC - Collier Road, Bayswater WA...The guy lives in Mandurah. If you can find an older spray painter they should still be able to do it - it's a dying art.
Start by cleaning and polishing back to original the area - my guy uses a colour swatch card to get it close (there is hundreds of shades of white) he then adds droplets of various tints to get it exact.
I put Andersen bailer in a Stellar SE and painted around the area about a metre either side of it - you can't see the join...It was an exact match.
It's almost impossible with gelcoat - even if you have the same batch...When you add catalyst and/or styrene (so you can sand/polish) it changes the colour ever so slightly...and in time will show more so.
Previous craft: Affinity, Endorfinn, Multisport, Epic V8, V10sport, V10, V12, Fenn Swordfish, Spirit PRS Elite; Stellar S18S, SR, SE, SEL, S2E, S2EL
Current Skis:
Huki S1-R
Stellar S18S - Excel
Stellar SR - Ultra
Skis on order: None!