Water Level Controls and Devices. A water column is used on a steam boiler to reduce the turbulence and fluctuation of the water level so the gage glass can provide a steady, accurate water level reading. The use of a water column is not mandatory.
Preparation. Verify the paint is completely dry. Never use varnish to seal acrylic paint if it is even slightly wet. Dust the surface of the dry paint gently with a clean cotton rag or paper towel. Rinse a jar or cup with water to remove any dust particles. Read the label on your varnish to find the correct water-to-varnish ratio. Mix the varnish with water in the jar or cup.
You'll notice when painting with acrylic paint that they dry to a flat finish. But mediums abound that can be added to the paints to increase luminosity or to get a matte or semi-matte finish. Acrylic pigments can also be diluted with water or a medium to create watercolor-like transparent washes.he answer is a water-soluble medium made from a synthetic resin binder mixed with pigments. The water soluble aspect of acrylic paints means that a painting dries quickly and you do not have to use solvents to dilute the paint or for cleaning brushes or a palette.