Mist coat is arguably the most important element to putting the finishing touch, the paint, on any building work. It is usually the biggest difference between an amateur and a professional paint job.
This could be argued to be not completely correct, but there is no doubt how crucial the primer is when painting walls.
The primer which is known as sealant or undercoat is the key to painting. If a painted wall (especially recently painted) suffers from paint peeling, flaking, blistering and other blemishes, it is probably because a primer has not been used at all or has not been used properly.
Out of all available primers, mist coating is probably the most common, affordable and easiest to use, especially on minor and major home improvement projects. However, all of this depends on getting the mix ratio and application right.
What is a Mist Coat and What is It For?
For paint to stick, the surface that it is applied to has to absorb it and the two have to bond with each other. This bond/adhesion is aided by the paint’s moisture content. The more moisture it has, the easier it is to be absorbed by the surface or environment (commonly known as evaporation). Let’s focus only on absorption by surface for now.
Paint that is too thick will not bond with or stick to the surface because moisture (the bonding element) is insufficient. When this occurs, blemishes are likely to appear as mentioned earlier.
That is why you need a primer that is less concentrated and more adhesive than the top coat. It serves as a sealant for the surface (plaster or otherwise) and a base that makes it easier for the top coat to stick which will give you a beautiful, pro-looking result.
A mist coat is the easiest primer to find and use because it is just diluted paint. Formed from paint and water, the higher moisture content of the mist coat allows it to improve adhesiveness for both itself and the top coat.
The best paints to use for mist coat are water-based p