Heavy body paints can be thinned with fluid medium and/or water to reach the right consistency. You can squeeze paint onto your palette and mix in very small amounts of water or medium until it reaches a thick, but flowing consistency. If you want to mix up a larger batch, below is a video demonstration for you on thinning your heavy body paints. There is no exact recipe, just add your water and/or medium a little at a time until you’ve reached a yogurt or sour cream-like consistency.