Although I don't think it's wrong to have painted helmets, there could be a small chemical basis for the use of the "illegal altered helmets"-rule. When the used paint contains "weakeners", then the helmets aren't save anymore to use. The plastics will be more or less become fluid... And then therfor it's illegal altered. Beware: you can't see it (besides the paint)!!!
Not all the brush-paints have those weakeners (think about MethylEthylKeton/ Toluene/ (Cyclo)Hexane etc.)... In Europe most paints are forbidden to have those chemicals. We are indeed afraid for OPS, a problem which lots of painters suffer. Some can't remember a thing or gotten crazy...
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