Definition - What does Primer mean?
Primer is a base protectant used on the outer surface of a substrate before painting. Primers shield the area and ensure better grip of color to the outer surface. In addition, primers increase the color strength and prevent attack on the substrate by air, water or other elements.
There are different kinds of primers available, based on the intended use. Some primers are produced to bond well with metal surfaces, while others are developed for brickwork such as concrete components.
Corrosionpedia explains Primer
Metal primer must provide an excellent bond by technical anchorage. Modern corrosion-resistant covering systems used over metal contain inorganic or natural zinc oxide. The zinc is assaulted by the electrochemical deterioration process preferentially before metal, and therefore defends the metal substrate with this sacrificial property. Primers are always pigmented.
When to use primer:
- On new, dry surfaces or roofs where no color has been used before, as it closes the surfaces and provides a sleek, consistent area
- On standard water stain walls, ceilings or materials which are not water-resistant
- Before painting areas with a drastically different color or different type of coating; for example, if areas and roofs are already protected with oil-based color and are being preparing for polymer color
Primer is not necessary when using an identical shade or type of paint for re-painting a surface; for example, polymer color on polymer.
It is important to choose a primer product based on the requirements of the project. A top-quality primer gives a firm base for the total color project. It builds an effective hurdle against spots and dampness, and creates a consistent and attractive top cover.