A rough first cost, usually thinned down, and usually only applied to fresh plaster or render. Contract paints are ideal for fresh plaster as they don't contain any vinyl (something that can lead to paint not adhering well to fresh plaster due to the extreme absorption of the surface). A mistcoat may also be useful when drastically changing colours- e.g if going from a dark blue to a light red, it could proce economical to do a white 'blocking' mistcoat before applying the red.