The fundamental rule of thumb for paint primer is that it is necessary whenever you cannot make a completely level surface prior to painting. Surfaces that have cracks, openings or dents that aren’t correctly closed up could significantly lessen the paint’s capacity to set successfully. So, inherently porous substrates for instance lumber, drywall and concrete tend to have primer recommendations attached. The natural openings in these materials will create an uneven surface for painting. But each of these materials needs to some extent special attention, however it pays to understand what separates one from the next.
Lumber and wood are the most typical surfaces used for paint primers, a fact that is hardly unexpected bearing in mind its organic and natural texture. There are two reasons you always want to prepare wood prior to painting – to protect the paint, and in addition protect the wood. Several modern paints dry into accurate shades and hardness because of evaporation, meaning they require the moisture to locate its way into the environment. The challenge is that wood is an especially absorbent material, and it is easy for moisture to get soaked up into the grain. Frequently the paint begins to wrinkle in addition to peeling if the lumber is not as dry as a bone, which makes it necessary to resurface and start all over again. Paint primer generates a water-resistant seal connecting both and ensures the paint has a smooth and adhesive surface with which to attach.