If you apply topcoat paint without a primer, it will peel off. Compared to products that have both primer and topcoat, those without primer have weaker adhesion to the substrate, making the paint film more prone to peeling.
When comparing products that only have a topcoat without a primer to standard painting products that include a primer, it was found that the products without a primer easily had their paint film peel off.
Primer paint has the dual effect of preventing rust and strongly adhering to the substrate and base material, so it cannot be omitted.
Although the primer is not visible, it plays an important role in maintaining corrosion resistance.
Additionally, if the primer is not applied properly, the topcoat may be applied unevenly or show inconsistencies, resulting in an unattractive finish.
Furthermore, the primer enhances the permeability of the paint, allowing the topcoat to adhere better, which can improve the durability and anti-corrosive properties of the paint film.
In other words, the primer is a crucial step that significantly affects not only the appearance but also the performance and lifespan of the paint.
Therefore, omitting the primer greatly increases the likelihood of having a paint job that peels easily or products that are prone to rust, making it essential to always apply an appropriate primer.
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