Nap and sponge
Nap and sponge External plaster should be mixed with clean sharp sand, not too fine, in the proportion of 3 or 4 parts sand to 1 of cement. The wall to be covered should itself be dry, but the surface should be well wet down with a hose to prevent it from absorbing at once all the water in the cement; it should also be sufficiently rough to form a good key for the cement. Screeds may be formed on the surface, and the cement should be filled out the full thickness in one coat and of uniform substance throughout. When cement is put on in two or three coats, whether for exterior or interior work, the most popular finish is a nap which is done with a sponge leaving a slight stipple or it can be left smooth.
Dry dashing
This is a rough textured finish created when a suitable crushed aggregate is thrown onto a freshly applied coat of mortar and left exposed. It is widely used in the construction industry on housing and buildings as a maintenance-
Wet dashing
Wet dashing Traditional Wet Dash requires the addition of clean water and white or grey cement resulting in an off-