




🛠️ Seal like a pro, race like a champ!
LOCTITE 518 is a 50 ml anaerobic gasket maker designed for metal flanged surfaces, curing quickly without air to form a durable, medium-strength seal. It works on aluminum, iron, and steel, tolerates minor surface contamination, and performs reliably even in low temperatures without primer. Sensor-safe and low odor, it’s a top choice for emergency repairs and professional-grade automotive maintenance.
| ASIN | B01M9EY8FE |
| Best Sellers Rank | #9,994 in Automotive ( See Top 100 in Automotive ) #17 in Gasket Sealers |
| Brand Name | Loctite |
| Color | Red |
| Compatible Material | Metal |
| Customer Reviews | 4.8 out of 5 stars 629 Reviews |
| Included Components | Unit^Instruction Guide |
| Item Dimensions | 6 x 2 x 6 inches |
| Item Form | Putty |
| Item Height | 6 inches |
| Item Type Name | LOCTITE 518 Automotive Anaerobic Gasket Maker & Flange Sealant - Sensor-Safe, Low Oder, Non-Corrosive - 50 ml, 1 pack |
| Item Weight | 2.26 ounces |
| Manufacturer | Loctite |
| Material Type | Acrylic |
| Style Name | Tube |
| Surface Recommendation | Miscellaneous |
| UPC | 079340010772 |
| Unit Count | 1.69 Fluid Ounces |
| Water Resistance Level | Not Water Resistant |
C**Y
Good stuff
Best gasket maker in my opinion. Left if for a week because of logistical issues. Did not cure and was able to slap the part on a week later with no issues. Rtv would have dried and had to be re applied
S**X
Works without primer down to at least 40F
Used on a 9.9 yamaha outboard. Crankcase cover and coated the base gasket. Sub 60 degrees F above freezing, no primer/activator. I didn't start the engine for 3 days after installing the powerhead. Used a sheet of plastic to lay the base gasket out and glived hands to coat with sealant. Plastic stayed on my table for 2 days and never set up. I smeared this leftover sealant on 2 washers and clamped then together. It set up fine overnight without being open to air at about 40F.
C**R
Good stuff.
Works great on precision flat flanges. Seals up nicely
B**Y
Great for gasket sealant
Used it with gasket on a clutch to front casing on a Honda trx500fe foreman 4x4es. Works great. If a problem arises I will repost the problem. It’s a little pricey but can be used without gasket material. I already had a gasket so I used it in addition to a thin application of loctite 518 sealant on each side of the gasket, it takes a very small amount of 518, so you can get many uses out of one tube.
D**M
Good product worked with out activating primer
Used this product to seal two halves of an aluminium outboard crankcase. Directions said to use primer I did not. I thoroughly cleaned both surfaces with lacquer thinner then used a small paint brush to apply a thin coat to each side making sure to give a little distance near bearings. Then assembled crankcase let set for a couple of days. I was concerned after reading some reviews that the product would not cure properly without primer so I disassembled to check cure before completing assembly. All was fine cleaned again resealed and reassembled let sit for a week before running motor. No leaks ofter running motor multiple times. One tube will do many small engines. Would recommend. set time was not a big rush product cures when air is absent after assembly.
P**L
Interesting stuff
Never knew this existed. Only dries where oxygen is taken away. Just used it ,fingers crossed for no issues.
K**R
Perfect
Perfect 518 rocks
M**S
Must use to seal rear main plate.
Used on my 2003 Trailblazer when replacing the rear main seal.
Trustpilot
2 weeks ago
1 month ago