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Jose a Umanzor · 08/31/2026
National Supply Co.

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Earn $0.24 (24.99 points) for the purchase.
SKU: 87292-2PACK|UPC: 749460695608
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Plug Leaks, Gaps, and Cracks with Confidence:
Maxi-Seal Polyurethane Seam Sealer tackles even the toughest auto body repair challenges. This thick, single-component formula easily patches large cracks and provides superior adhesion on bare, primed, or painted metal surfaces. No more worries about leaks or rust – this sealant creates a durable, long-lasting barrier.
Complete Kit for Seamless Application:
This isn't just a Polyurethane Seam Sealer – it's a complete solution! We've included everything you need for a smooth and hassle-free application, including:
High-Quality Sealant: Formulated for superior performance on all vehicles and RVs.
Application Tip: Ensures precise and mess-free application.
Long-Lasting Performance, Guaranteed:
Maxi-Seal Polyurethane Seam Sealer boasts a non-shrinking, non-cracking, and low-odor formula that stays remarkably flexible over time. It won't let you down, even in harsh weather conditions.
Fast Curing, Easy Finishing:
Get back on the road quickly! Achieve a flawless finish that blends seamlessly with your vehicle's body.
Unmatched Versatility and All-Weather Protection:
Maxi-Seal Polyurethane Seam Sealer is built to withstand anything you throw its way. Its enhanced moisture-curing properties ensure a durable hold for both interior and exterior applications. This urethane-based formula is worlds ahead of solvent-based sealers, offering superior performance in high heat and humidity.
The Perfect Choice for Any Project:
All-Purpose Auto Body Repair: Fill gaps, joints, and seams with ease.
Rust and Corrosion Protection: Shield your car, truck, boat, or RV from the elements.
Multi-Surface Application: Bonds to bare metal, painted surfaces, and more.
Easy Application: Fast cure time and mess-free application with the included tip.
Don't settle for anything less than the best. Choose Maxi-Seal Polyurethane Seam Sealer for lasting repairs and a beautiful finish on your vehicle.


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Suitable for automotive metal, plastic trim, and properly prepared body panels. Always test adhesion on a small area first.
5.0
Based on 5 reviews
Fast shipping👍
Jose a Umanzor · 08/31/2026
Goes on smooth.. paint coveted well
Marc Simpson · 06/08/2026
No waiting here, I received my purchase in a very timely manner. The pricing is exceptable and the clincher was the free shipping! I will definitely purchase more National Supply products in the future
David · 04/08/2026