Is it necessary to apply primer before applying putty to a car?
2 Answers
It is highly necessary to apply a coat of primer before applying putty. The first layer of primer on the surface can effectively enhance the adhesion of the putty powder. Functions of primer: Primer is a material that can be directly applied to the surface, making it more solid and serving as a foundational layer. It's similar to how when applying makeup, a girl first applies a layer of lotion or toner, followed by a base or sunscreen, ensuring the makeup stays firm and prevents issues like powder caking later on. Putty application techniques: During the putty application process, the surface must be thoroughly cleaned. Any bulges, peeling, or dust on the surface should be removed to ensure a clean working area.
I've been in the auto repair industry for many years and often encounter this question: Should you apply primer before filling with putty? My experience says yes, applying primer is a crucial step, especially when metal is exposed. Skipping primer and applying putty directly can lead to rust and poor adhesion, causing later repairs to crack or bubble. Remember to spray a thin protective layer of epoxy primer—it blocks oxygen and repels water—then wait for it to dry completely before applying putty. After sanding smooth, you still need to apply high-build primer and topcoat for a complete repair. Don’t skip this step to save time, or you might end up redoing the job, wasting both time and money. Tool selection is also important: use a high-quality spray can, clean the surface thoroughly before working, and ensure it’s free of oil and dust.
