Thanks for asking about safe products - it shows Respect for your Models - and they will thank you for it!
There are a LOT of cosmetic body paint choices - from liquids to water or alcohol activated pans. The application and blending range is as diverse as paints for canvas. Each kind and brand will have it's own sweet spot.
For brush applied and blendability - look to a product like Mehron Paradise.
Ben Nye Magicolor is a nice, thicker liquid body paint that can be sponge or brush applied.
For super thick, super inexpensive colors, try Palmer's face paint.
Crisp line work - you can't go wrong with a sampler like WolfeFX Appetizer Palette.
You can use mid-quality paint brushes - my favorite are Simmons or Royal Langnickel. I would advise using NEW, dedicated brushes for bodypaint.
You don't want to use non-cosmetic products - there's a real reason the pigment range is restricted for cosmetic grade colors.
Look to a site like www.sillyfarm.com
for what's popular with Facepainters and Bodypainters.
Bodypaint FAQ: http://www.modelmayhem.com/po.php?thread_id=243647
Non-Toxic is NOT Makeup: http://battledress.deviantart.com/journ … -214185627