Berkland Polyurethane Seam Sealer for Auto Body — 2-Pack Black, Flexible & Paintable

Berkland Polyurethane Seam Sealer (2-pack, black) is a flexible, paintable auto body compound designed to fill and seal seams, joints, and weld areas on bare, primed, or painted panels.

This two-cartridge kit delivers a professional-grade, non-shrinking polyurethane seam compound that cures quickly, resists cracking, and has low odor for easier work on cars, trucks, RVs, and boats. The black base hides in dark cavities like wheel wells and rocker panels, while remaining paintable for visible areas. Formulated to bond to metal, fiberglass, and many composites, the sealer works for interior and exterior seams and provides a durable, weather-resistant barrier once cured.

How does this seam sealer make auto body repairs more reliable?

The urethane formula remains flexible after curing so it accommodates vibration and metal movement that would split brittle sealants. It’s engineered to resist shrinking and cracking, preserving a consistent seal along welded flanges, floor pans, and drip rails. Low odor and reasonable cure times reduce downtime on multi-step restoration jobs.

• Non-shrinking, non-cracking polyurethane compound
• Flexible after cure to tolerate panel movement
• Low odor for more comfortable use in enclosed spaces
• Waterproof and weather-resistant when fully cured

What surfaces and repair types is this product suitable for?

Berkland’s seam sealer bonds to bare metal, primed surfaces, and painted panels, plus fiberglass and other composites often found in RV and marine work. Use it to seal weld joints, fill seams, mend floor pans, and protect door jambs or wheel wells from moisture intrusion. It’s also suitable for weld-through applications when coatings are removed from weld flanges.

• Bare steel, primed metal, painted panels, fiberglass
• Weld joints, seam bonding, floor pans, drip rails
• RV roofs, truck beds, undercarriage seams, marine joints
• Can be brushed on around weld flanges for welding prep

How do I apply and finish the seam sealer for best results?

Clean surfaces with a VOC-compliant cleaner and scuff to promote adhesion before applying. Load the cartridge into any standard caulking gun, trim the nozzle to the desired bead size, apply, and tool the compound to shape the seam. It skins quickly and becomes paintable within about 30 minutes; allow longer before sanding and topcoating for optimal results.

• Clean and scuff surfaces; remove debris before use
• Pierce seal, install nozzle, trim for correct bead size
• Tool to profile; paintable in roughly 30 minutes, full handling later
• Allow 45 minutes initial cure; 24 hours recommended before sanding/painting

What comes in the kit and how much area will it cover?

The package includes two 10 oz cartridges and nitrile gloves for cleaner handling. Each cartridge dispenses a continuous bead suitable for panel seams and localized repairs; two cartridges are-sized for multiple panels or a full floor pan job depending on bead size. It fits standard caulking guns for precise application.

• Two 10 oz cartridges (standard caulking gun compatible)
• Nitrile gloves included for jobsite cleanliness
• Black base reduces paint coverage needs in concealed areas
• Covers multiple seams; actual coverage varies with bead width

Who is this for: Professional autobody technicians, restoration enthusiasts, DIY mechanics, RV and marine owners who need a paintable, resilient seam compound that bonds to many substrates. Choose Berkland’s black polyurethane seam sealer when you want a long-lasting, flexible seal for welded panels, floor pans, wheel wells, and other seams where durability and a clean finish matter.