Its an acrylic texture medium with paint added.
Apply it straight where texture is desired.
When it runs out... dont buy another pot from
GW, go to an art store and browse for acrylic texture gels/mediums. they come in a wide range of textures and in decent quantities, mix these with colours for coloured texture, or paint over it. Or both.
http://www.artsupplies.co.uk/cat-texture-gel-mediums.htm
Here Liquitex ones are £8.81 for 247ml bottle (3.57pence per
ml), vs
GW's £2.30 for 12ml (19.17 pence per
ml)
Thats a 536.8% difference in value for money for what is genuinly the same thing without a colour added - which is better as your no longer limited to just the one