The 8 Best Automotive Seam Sealers

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This wiki has been updated 17 times since it was first published in March of 2018. Most typically used in the restoration of classic cars and fixing problems in modern ones after crashes, automotive seam sealers come in a small range of varieties. They can be applied to both interior and exterior sheet metal overlaps in order to create a watertight joint, and they can either be sprayed, squeezed or brushed on, depending on your specific application. When users buy our independently chosen editorial choices, we may earn commissions to help fund the Wiki.

1. 3M Flexiclear

2. Eastwood 51655

3. 3M Dynatron 550

Editor's Notes

March 05, 2021:

While you can find automotive seam sealers from a variety of companies, we recommend sticking with the best and most respected brands in the industry, which is exactly what you have here. It should be noted that there aren't a lot of changes made in the formulas and sealants available from year to year, and as such, no adjustments needed to be made to our recommendations at this time. The sealers you'll find here have been proven to perform, and perform well, which is why we continue to recommend them. If that changes for any reason, we will be quick to reflect this in our lineup.

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.

4. J-B Weld 31919

5. Permatex 81173

6. Evercoat 365

7. SEM 29392

8. Transtar 4167

Rafael Perez
Last updated 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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