Not really. Being legal has nothing to do with it. You can legally buy full slicks for your bike too, but using those on the road is illegal as well.
Simpson helmets are approved for racing use and there's nothing wrong with them, but they're just not allowed on public roads.
As for the airbrush : if they use the wrong paint, the shell can become much harder, which makes it much more brittle in a crash.
Also, I'm not too impressed with the level of detail on those examples you've shown. Sorry, but that looks like the work of an amateur.
they're his standard designs, i think they are done by template, having looked at loads of pictures of various stuff he has done i'm not really concerned about lack of quality.
i have just googled reviews etc, says they are legal as far as i can tell, approved standards etc. can't see why it wouldn't be legal? besides i can ask the questions when i call him
also google revealed the stig used/uses them, not that that makes any difference to me.
They are legal for motorsport as they have the correct Snell marking, but I think there is an issue about the shape of the chin guard that stops them being issued with the BS number and thus being legal for use on the road. You can buy helmets from, I think, Davida, that are from there retro range that have no BS number and are thus technically for display/ off road use only, but they do look cool on old vintage bikes.
I could be talking out my arse, and got completely confused, but I would just check first before spending out.
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Use 320-grit sandpaper to prepare the helmet surface. Sand evenly until all the shine is removed. Paint only with acrylic enamels. Lacquer paints are not compatible and will weaken or destroy the shell. Do not allow any solvent or paint to come in contact with the inner shell.