Helmet issue..

[Rippthrough]

Guys seriously all fair points made as regards spraying helmets etc, but for goodness sake most of us go for a spirited drive every so often on public roads with no helmet. It's not a friggin race series, it's a track day. Yes the speeds are higher and if it goes wrong obviously that relates to a bigger smash potentially, but imo you're at significantly less risk than going for a blat down your favourite backroads, which you'd do withouta helmet...

IIt's certainly very interesting information but id hardly say it's as important in this scenario where there should not be any actual racing...

No, but if you already have a helmet to wear, it's not the brightest idea to deliberately make it worse at doing it's job...
There is another issue, if the solvents had acetone or similar in, which the panel wipe may well have, that will continue to penetrate the resin matrix and soften the shell over months. Now, the only thing a helmet with a soft matrix is good for, is clamping your head like a vice if it ever gets hit, because it'll dent instead of spreading the impact, and hold that pressure against your skull until you can lever the helmet off/cut it away.
Is it unlikely? Yes.
Is it a possibility? Yes, which is why they advise against it unless the correct paints and processes are used.

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I just want a helmet thats black as f*ck, that in turn makes me look proper racecar.. and I wan't it cheap.

There ain't many racers that wear black helmets, unless they're in open top cars...for good reason, the heat builds up in the cabin and you get a nice hot, sweaty head.