In reply to French Erick:
Most climbing centres use a product called Coo-Var Suregrip Floor Paint, it is avaliable in about 8 colours of the shelf (grey, red, yellow, black, white, blue, light grey and green)
It can be purchased from or ordered thru all good paint stores, i even believe that the sheds (B&Q, Homebase) can get hold of it, but this will take longer.
http://www.coo-var.co.uk/floor-sports-line-paints/suregrip-antislip-coating...
Hope this helps