Berkland Polyurethane Seam Sealer — Paintable Auto Body Joint Filler 10.5 fl oz (White)

Meet Berkland's Polyurethane Seam Sealer, a paintable, flexible solution designed to seal auto body seams, weld joints, and gaps with long-lasting performance. The polyurethane formula remains pliable under temperature changes and road vibration, resisting shrinkage and cracking while delivering a neat, professional finish.

Why choose Berkland seam sealer

Designed for reliability, this sealer forms a durable bond that moves with metal panels rather than pulling away. It supports interior or exterior seams and stays flexible through heat, cold, and driving stresses, reducing the need for rework over time. The paint-ready finish simplifies topcoating steps and helps you achieve a consistent look across panels.

Fast, paint-ready workflow

Paintability is a standout feature: apply, wait about 30 minutes, and you can prime and topcoat the same day. A fast cure minimizes downtime and lets you progress from seam sealing to finishing without long delays. For best long-term results, follow the prep and scuffing guidance before painting.

Universal surface compatibility

The sealer bonds effectively to bare metal, primed surfaces, and already-painted panels. It also adheres to fiberglass and composite substrates, making it a versatile choice for various restoration or retrofit projects—from wheel wells and door jambs to floor pans and drip rails.

With a single cartridge, you can tackle targeted repairs, seal tight seams, and create clean joints on body panels, welds, and riveted sections. The kit includes nitrile gloves and fits standard caulking guns for simple, controlled application.

Durable, weather-ready performance

Expect a flexible seal that stays put under weather exposure and road conditions. Once cured, the seal is waterproof and weather resistant, helping protect the substrate while preserving the surface finish of painted panels.

What you get

• One 10.5 fl oz cartridge
• Nitrile gloves for clean handling
• Compatibility with common automotive primers and topcoats
• Suitable for automotive, RV, and marine applications

Usage tips for best results

• Prep: clean with VOC-compliant cleaner, and scuff bare or painted surfaces before application.
• Application: pierce seal, install nozzle, load into caulking gun, trim nozzle, and apply to the seam.
• Cure and paint: allow ~45 minutes to cure; 24 hours before painting for best results; painting can begin after about 30 minutes if you are in a hurry.
• Weld-through: remove coatings around weld flanges, apply sealant, then proceed with welding as needed.