What is a benefit of using urethane primer-surfacers?

Using urethane primer-surfacers is advantageous primarily because they provide excellent adhesion properties, which are crucial for ensuring that the topcoat adheres well and lasts over time. This strong bond is essential for maintaining the durability and appearance of the finished paint job. Additionally, urethane primer-surfacers can be sanded both wet and dry, giving painters flexibility in their preparation processes. Wet sanding can minimize dust and provide a smoother finish, while dry sanding is often quicker and more efficient, making it easier to attain the desired surface texture before applying paint.

The other options are less accurate when considering the overall characteristics of urethane primers. While some primers may not require sanding before application, this is not universally true for all urethane primer-surfacers. Cost-effectiveness can vary, and urethane primers are often more expensive than certain other types, which diminishes the validity of their affordability as a primary benefit. Lastly, although urethane primers cure effectively, they do not dry instantly; they require time for curing to achieve the best results and facilitate proper adhesion for subsequent layers of paint. The qualities of adhesion and sandability are what truly set urethane primer-surfacers apart in the refinishing industry.