So, finally i bought gouache paint for body paint purpose. Its not that i was very happy with this result, but it's still a skill i want to develop. Now about the gouache paint, from my own research i would probably check other paint that is for skin purpose only, but since its more expensive i desided for now, to use the gouache. It does not tell you whether the pigments used are harmless or not for your skin. I guess i'll have to find out on myself :) Anyway, It is easy to use, apply & water based color, which means it's easy to remove.
The process