What paint do you guys use ? And how to get huge quantity of that paint.

There are many ways to do this. Gone are the days when doing such a thing meant covering the body in toxic substances.

If you want metallic gunge - you can buy this online from Messy Supplies.

For gold and silver body paint - like a living statue- there are specialised cosmetic powders and oils you need to mix together (ready mixed won't be so good). This is tricky and the terrain of the professional transformational makeup artist. Google it. There are a million tutorials.

mehron powder and sunflower oil.