Role of Primer

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Painting is the cost effective defense tactics to protect the surface of anything from dust, dirt, termites, mold and mildew. It also safeguards the surface from environmental elements like heat, wind and rain. The environmental elements can cause severe damage to underlying construction materials like siding, bricks, doors and windows trim etc.

Shine and gloss is common with professionally painted new building. But doing it yourself could not deliver the same result. One of the reasons behind this is you lack expertise. Normally, DIY-ers skip priming because they want to save some money as a result your effort does not meet expected result.

Priming before painting is an important and mandatory step. It increases your cost a bit but ensures long life of the paint so it cannot to be omitted. Here below we discuss some of its importance:

What is primer?

Primer is preliminary coating applied on materials before painting. It generally consists of synthetic resin—20% to 30%, solvent—60% to 80% and additive agent—2% to 5%.

Why priming Role of primer is necessary?

All new surfaces are required to be primed prior to painting including dry walls, concrete, wood and metal. Application of paint to unprimed surfaces may cause additional peeling and developments of cracks in comparison to primed surfaces. New/bare drywall soaks up paint like a sponge and application of primer restricts this which means saving to you.

To prevent peeling and allow paint to last longer, it is important to scrap and sand outside surfaces then prime with quality exterior primer before painting. Priming exterior surfaces seals unfinished wood, allows paint to bond properly and reduces the chance of peeling. The primer will help to hide small defects and joints and seams when it is applied to dry wall and other surfaces.

Surfaces that have been previously painted may not need priming, unless the oil based paints are being changed to latex paint or the previously applied paint is already deteriorated.

Interior surfaces should also be primed to prevent stains and bright colors from bleeding through. If you have any type of water stain, you can hide it through primer and begin fresh coat of paint on it.  Also if you are trying to paint over bold and darker colors, it is essential to use primer to block out that color. Your finish coat will look more vibrant because it will not be influenced by whatever color you had earlier.

It is essential that primers should only be applied to dry and clean surfaces. Since the primer fumes may be toxic, proper ventilation should be ensured by opening windows and use of fans. Take precautions before starting the priming job—use mask or respirator.

Types of primer

Oil-based primers give strong odor while curing and are more difficult to clean up requiring paint thinner. It is good at providing barriers to keep the wood from bleeding. Oil based primer is better for area that comes in constant touch such as doors, windows and cabinets.

Water-based primers produce least odor, clean up easily with water and are better for blocking solvent-based stains such as ink or grease. However, it is fine for areas that are least in reach such as crown moldings. Latex primers are great for blocking stains.

In case of metals, primer forms the protective film. Metal primers protect underneath surface even if the paint film wears out or get damaged. Primers protect metals from rusting away.

All-purpose primer is very advantageous because of its strong adhesive properties, and it works without the solvent odors and high VOCs common with most stain-blocking primers.


Priming ensures better adhesion of paint on the surface. It increases paint’s durability and provides additional protection for the material being painted. Primer also seals the pores in the permeable materials and adverts bleeding from knots. If applied properly, primers will enhance the life of the paint and also improve the appearance.

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