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🛡️ Prime like a pro — bond stronger, cure faster, perform better!
Loctite 37509 Klean 'N Prime is a high-viscosity aerosol primer designed to activate anaerobic adhesives on inactive metals like stainless steel, aluminum, and plated parts. It accelerates cure times even in cold environments below 41°F, ensuring durable, water-resistant bonds across a wide range of automotive and industrial applications. Trusted by professionals for precision and reliability in prepping surfaces from fasteners to engine components.









| ASIN | B0002KKTSG |
| Best Sellers Rank | #32,304 in Automotive ( See Top 100 in Automotive ) #111 in Care Corrosion & Rust Inhibitors #1,321 in Oils & Fluids |
| Brand Name | Loctite |
| Color | Gold |
| Compatible Material | Aluminum, Metal, Stainless Steel |
| Container Type | Can |
| Customer Reviews | 4.8 4.8 out of 5 stars (343) |
| Global Trade Identification Number | 00079340375093 |
| Included Components | (1) LOCTITE 7649 Klean N’ Prime | 4.5 oz Can |
| Item Form | Spray |
| Item Package Quantity | 1 |
| Item Type Name | Adhesive Primer |
| Item Weight | 0.42 Pounds |
| Manufacturer | Loctite |
| Material Type | Silicone |
| Model | 37509 |
| Specific Uses For Product | Fleet and plant maintenance. |
| UPC | 079340375093 |
| Unit Count | 4.5 Ounce |
| Viscosity | High Viscosity |
| Volume | 4.5 Fluid Ounces |
| Water Resistance Level | Water Resistant |
R**S
Loctite primer
LT primer in spray can .works as designed!
B**Y
Good Product for Cleaning before Assembly
1st off, this product IS NOT intended to clean greasy parts from the get go. It's merely use as a final clean before assembling your parts. Note: This product contains ACETONE and BUTANE and is highly flammable. Even though Acetone and Butane is not consider extremely toxic on certain web sites, I would consider as such. Meaning, you should be in a WELL ventilated area. I did my work outside and it still can take your breath away. I would highly recommend wearing gloves (e.g. nitrate) while working with it. It will dry the moisture out of your skin. Finally, wear a face shield for eye protection too. I hung my parts [bearing race] on a wire as I sprayed them down and let them dry. It remove any residual oil film on the race. I am using Loctite 660 to glue this bearing in place, due to spinning on its own. All of this is needed to insured that the glue bonds to both metal surfaces for the bearing race. I am well pleased how my project turn out and save me an expensive repair.
D**R
Fingers crossed, so far the "permanent" Loctite is holding fast
First, "what's inside": Acetone 67-64-1 60 - 100% 2-Ethylhexanoic acid 149-57-5 0.1 - 1% Isobutane 75-28-5 10 - 30% Basically: cleaner, catalyst, and propellant. I had a knurled grain mill roller with a right-hand-threaded drive shaft that unfortunately I wanted to run in reverse, which mean the shaft would immediately unthread. I picked up some "permanent" Loctite and this "Activator" and after first cleaning both male and female threads to within an inch of their (or my) lives I applied the "Activator" to both parts, let them sit for an hour to ensure both parts were thoroughly dry, then applied the thread locker and screwed in the drive shaft and then let the assembly sit for 24 hours. Tested the mill with a full hopper of grain (~18 pounds) and it plowed through it all with zero issues. Knock on wood :) Cheers!
B**T
Own it
Buy it
J**L
Great for priming stanless steel
I have four non-tapered stainless steel pipe connections on a heating system storage tank. All attempts to seal the fittings with tape or pipe sealants failed until I primed the fittings with this product, and used Loctite thread sealant. One warning, after applying loctite thread sealer, the sealant begins setting within minutes, so if you prep the threads with this product, keep in mind that it quickly cures thread sealant. For Stainless steel pipe fittings, I highly recommend this product.
M**C
Loctite
Works as expected
M**T
Use at assembly to prevent leaks and seal. OK for break lines.
Nice sealer to prevent leaks, easy to use, works well, but you must use the activator/cleaner for it to set up.
I**Y
Great!
This Loctite Primer is great for instantly hardening the 401 and 406 Prism adhesives. I have used it to stiffen joints and plastics. Its really important to have this on the shelf just in case. When you spray it, don't have the container of adhesive anywhere near it. You might glue it shut!
B**R
excellent
M**C
Works exactly as described
Trustpilot
1 month ago
1 month ago