Berkland Polyurethane Seam Sealer 2-Pack, Black – Paintable Auto Body Sealant, Flexible 10 oz Cartridges

Berkland's black polyurethane seam sealer (2-pack) is a paintable, flexible adhesive designed to seal and protect automotive seams, joints, and panel gaps with long-lasting adhesion.

If you need a durable seam compound for bodywork, this two-cartridge kit delivers a professional-grade solution formulated to resist shrinking and cracking while staying low-odor. The black finish blends into darker cavities and undercarriage areas, reducing the need for heavy topcoating. Each 10 oz cartridge fits standard caulking guns and the set includes nitrile gloves so you can work cleanly and control bead application easily.

How quickly can I paint over Berkland seam sealer?

You can topcoat or primer over the sealer shortly after application. The formula is designed to be paintable in about 30 minutes under normal shop conditions, letting you move through panels faster without long delays.

• Paintable in approximately 30 minutes for faster workflow.
• Best results if left 24 hours and lightly scuffed before final paint.
• Ambient temperature affects cure speed; warmer conditions shorten set time.
• Use VOC-compliant cleaners for surface prep to ensure adhesion.

Will it stick to bare metal, primed, or painted surfaces?

Yes — the polyurethane formulation bonds to a wide range of substrates commonly found in auto repair. Whether you’re sealing bare steel, a primed panel, or a painted area, it adheres reliably when the surface is properly cleaned and scuffed.

• Adheres to bare steel, primed metal, painted panels, fiberglass, and composites.
• Requires cleaning with a VOC-compliant cleaner and light abrasion for best contact.
• Strips coatings where weld-through is needed and re-applies for seam protection.
• No special adhesion promoter usually required for standard auto substrates.

Where on the vehicle should I use this seam sealer?

The product is intended for interior and exterior seams where a flexible, waterproof seal is required. It’s commonly used in wheel wells, rocker panels, door jambs, floor pans, drip rails and other joints exposed to moisture or vibration.

• Wheel wells, rocker panels, floor pans, and door seams.
• Weld flanges and weld-through zones when coatings are removed.
• RV roofs, marine joints, truck bed seams and other weather-exposed areas.
• Flexible enough to handle panel movement without cracking.

How do I apply and get a professional finish?

Application is straightforward with a standard caulking gun and basic preparation tools. Clean and scuff surfaces, pierce the cartridge, trim the nozzle to the desired bead size, and tool the sealer smooth; a short set time means you can continue work quickly.

• Clean surface with VOC-compliant cleaner and scuff with abrasive pad first.
• Pierce cartridge seal, insert into caulking gun, trim nozzle for bead control.
• Tool the bead to shape; allow initial set then re-scuff before final paint if needed.
• Includes nitrile gloves for clean handling and two 10 oz cartridges for larger jobs.

Who is this for: Body shops, restoration hobbyists, RV and marine owners, and DIY mechanics who need a reliable black seam compound that bonds to multiple substrates and speeds up finish work. If you want a non-shrinking, paintable sealer packaged for standard caulking guns and enough capacity for full-panel repairs, this Berkland 2-pack is built for those projects.