Updated October 15, 2019 by Rafael Perez

The 8 Best Automotive Seam Sealers

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This wiki has been updated 6 times since it was first published in March of 2018. Most typically used in the restoration of classic cars, automotive seam sealers come in a small range of varieties. Often applied to both interior and exterior sheet metal overlaps in order to create a watertight joint, these can either be sprayed, squeezed or brushed on, depending on your application. When users buy our independently chosen editorial recommendations, we may earn commissions to help fund the Wiki. Skip to the best automotive seam sealer on Amazon.

8. Transtar 4167

7. SEM 29392

6. Evercoat 365

5. Permatex 81173

4. J-B Weld 31919

3. 3M Dynatron 550

2. Eastwood 51655

1. 3M Flexiclear

Editor's Notes

October 09, 2019:

Removed Carborundum EZ Repair because of availability issues. Added the Eastwood 51655, the Permatex 81173, and the J-B Weld 31919.

The Eastwood 51655 is purpose made for sealing body seams and replacement floor pans. It has just the right consistency when cured to form a waterproof seal but keep everything in place. We included the Permatex and the J-B Weld because they can be used for metal seams but since they are RTV silicones, they come in handy for most silicone needs. Keep in mind that these are not oil-resistant. Special oil-resistant silicone is needed for parts that are meant to come in contact with oils.

Auto repair can be dangerous and should only be performed by trained technicians to avoid personal injury or damage to equipment.


Rafael Perez
Last updated on October 15, 2019 by Rafael Perez

Rafael Perez is a doctoral candidate in philosophy at the University of Rochester. His primary focus is the metaphysics of time and the philosophy of mind, with a particular interest in artificial intelligence and antirepresentational models of the mind. He has extensive experience as a mechanic, a construction worker, and a general repairman. This has allowed him to gather a wealth of knowledge on automobile repair, auto parts, carpentry, masonry, welding, and the tools used in those trades. In his spare time, he enjoys playing guitar, woodworking, and fishing.


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