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.
1 No. Concrete acid stain is not a topical coat like concrete paint or acrylic stains. 2  It penetrates the surface and chemically stains the concrete surface. 3  Acid Stain is to concrete, as wood stain is to wood. An acrylic clear sealer with paint pigments added. 2  When using acrylic stains, you are being tricked into painting your concrete. 3  Acrylic stains are only disguised paints designed with the sole purpose of seperating you from your cash.