10 Best Exterior Primers 2025 in the United States

The Rust-Oleum 249846 Painter's Touch 2X Ultra Cover is a versatile primer suitable for a variety of surfaces, including wood, plastic, plaster, metal, masonry, and unglazed ceramic, making it highly adaptable for different exterior and interior projects. Its oil-based formula is designed to be low odor and chip-resistant, providing long-lasting protection which is essential for weather resistance.

One of its notable strengths is its fast drying time, becoming touch-dry in just 20 minutes, which can significantly speed up project timelines. Additionally, the product covers up to 12 sq. ft. per 12-ounce can, making it relatively efficient in terms of coverage. The primer's flat black finish offers a good base for painting, and its durable formula ensures excellent hide and smooth application.

The spray format with any angle spray and comfort tip adds convenience and ease of use, especially for large or awkward surfaces. However, the product is not specifically marketed as having strong stain-blocking capabilities, which might be a consideration depending on the underlying surface condition. This primer is perfect for DIY enthusiasts and professionals looking for a reliable, fast-drying, and versatile primer for various surfaces, but those needing strong stain-blocking might need to look elsewhere.

The Rust-Oleum Zinsser 287512 Molding Blocking Spray Primer is a practical choice for tackling mold, mildew, and odor-causing bacteria. One of its standout features is its ability to block existing mold without requiring extensive pre-cleaning, saving you time and effort. This water-based primer is easy to clean with soap and water and has a low odor, making it user-friendly for interior tasks.

The fast drying time, with the primer drying to the touch in just 5 minutes and ready for a recoat in 30 minutes, allows for quick project completion, an advantage for those with tight schedules. Additionally, the primer covers around 8-10 sq. ft. per can, which is suitable for small to moderate areas, and works well under any topcoat, particularly with Zinsser Perma-White. It's compatible with surfaces like masonry and metal, making it versatile for various interior applications.

One downside is that the product is specifically designed for interior use, so if you're looking for an exterior primer, this might not be the best fit. Also, coverage per can is relatively limited, so larger projects might require multiple cans. The stain-blocking capability is effective against fungal stains, adding to its usefulness in areas prone to moisture and mold. This primer is ideal for indoor projects needing quick-drying, easy-to-use mold-blocking solutions but may not be suitable for outdoor use or very large areas.

The Zinsser 276087 White Mold Killing Primer is a versatile water-based product designed for both interior and exterior use. Its standout feature is its ability to paint directly over mold, mildew, and odor-causing bacteria, making it a practical solution for surfaces prone to moisture issues. Additionally, it has EPA registration, ensuring it meets safety and efficacy standards.

This primer is compatible with masonry and metal surfaces, making it suitable for various applications, including binding chalky siding. Its matte finish provides a smooth, non-glossy appearance, and it comes in a convenient 32-ounce can, covering up to 160 square feet per can. The primer dries quickly, with a full cure time of just one hour, which is beneficial for time-sensitive projects.

This product is best suited for individuals dealing with mold or mildew issues on masonry or metal surfaces, both indoors and outdoors.