10 Best Thread Lock Sealers 2025

If you're looking for the best way to keep your nuts and bolts from loosening over time, you've come to the right place. We've reviewed and scored many products in the sealants category, and we found products ranging from a 7.5 score up to a 9.3 score. Our top pick for thread lock sealers in the exterior care subcategory is the Loctite Threadlocker Blue 242 Nut/Bolt Locker. This product from Loctite received the highest score of 9.3, and for good reason. Its unique formula ensures a secure hold while still allowing for easy disassembly when needed. Say goodbye to loose bolts and hello to peace of mind with Loctite Threadlocker Blue 242 Nut/Bolt Locker. Check out our top 10 product review page for more information on this and other top-rated products.