Automotive spray paint can be tricky to work with. The wrong temperature, the wrong application or the wrong color match can ruin the job. While an easy coating can be achieved with a one-coat application, a truly glossy, professional-looking finish frequently is obtained using the two-coat approach. As a result, true aficionados of car restoration tend to steer toward the two-stage paint approach for automotive painting.
Defined
Single-stage or one-stage automotive paint is just that -- a one-application paint method. Assuming the automotive surface already has been prepped and primered to accept new paint, the one-stage paint is applied evenly in multiple coats and then left alone to cure and harden. Two-stage paint also involves a prepared surface, but then a base coat is applied and followed by a clear gloss coat.
Benefits
A two-stage paint will protect the colored paint underneath with layers of clear coat paint on top. This allows scratches and webbing from exposure to be hidden better with waxing, without damaging the paint color itself. A one-stage paint coat tends to have a deeper, stronger color base and finishes faster. If scratched or chipped, however, the damage can't be waxed out, and a spot paint repair is then required.
Application
The one-stage paint method requires skill and accuracy. Once it is dried, it is difficult to go back and correct a mistake without completely sanding and redoing the section entirely for a clean coat. The two-stage paint can be modified as the work is performed and corrected if needed. The gloss or shine can then be determined by how many clear coats are painted on afterward.
Maintenance
Both paint types can be waxed and shined, and both are susceptible to too much polishing that can wear through the paint surface. Both will fend off the elements and moisture, but the two-stage paint approach will likely retain color integrity longer as the base color is not exposed to fading. This added durability makes the two-stage better for maintenance.
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