Berkland Polyurethane Seam Sealer — Black, Paintable Auto Body Sealant (10.5 oz)

Overview

Berkland presents a durable, flexible polyurethane seam sealer in black, designed for automotive joints, welds, and gaps. The compound stays true to its form, resisting shrinkage and cracks, helping you seal dark undercarriage areas where visible lines should disappear.

Why choose this sealant

Whether you’re patching a door jamb, wheel well, or floor seam, this sealer provides a robust, paintable finish. The black base blends with dark surfaces, reducing the appearance of sealant lines while delivering reliable protection from moisture and outdoor elements.

Alongside its versatility, the material accepts paint within a short window, making it suitable for same‑day priming and topcoating on compatible projects. It bonds to a range of substrate types and remains flexible after cure, helping accommodate thermal movement and vibration across different vehicle configurations.

Key benefits

• Non shrinking, non cracking performance that maintains a cohesive seam over time.
• Paintable in about 30 minutes, enabling faster completion of cosmetic or protective coatings.
• Strong adhesion to bare metal, primed surfaces, painted panels, and even fiberglass or composite parts.
• Flexible, weatherproof seal suitable for interior and exterior seams on wheel wells, door jambs, floor pans, and more.
• Single 10.5 fl oz cartridge with gloves included for clean, controlled bead application using standard caulking guns.
• Suitable for automotive, RV, and marine applications, offering a waterproof seal after cure.

Ideal uses and surfaces

Apply across body panel joints, weld through areas, and joints around undercarriage structures. It works on bare steel, primed surfaces, and already-painted panels, and can even bond to fiberglass and other composites for broader restoration projects.

Color and cure dynamics make it well-suited for dark surfaces where paint coverage needs to be efficient. The fast initial set allows you to move on to priming and topcoating without long delays.

How to use

• Prepare the surface by cleaning with a VOC‑compliant cleaner and scuffing, then re-clean to remove debris before applying the sealant.
• Pierce the seal, install the nozzle, trim, and load into a standard caulking gun. Apply a clean bead and tool to your preferred finish.
• Allow about 45 minutes to set. For best results, wait 24 hours and scuff prior to painting.
• On bare metal or welded joints, abrade and clean before sealing to promote adhesion and longevity.

After curing, the seal is designed to resist moisture and weather exposure, helping maintain a sealed seam across challenging vehicle environments.