Loctite 545 Automotive Pneumatic/Hydraulic Pipe Thread Sealant Purple - High Lubricity, High Pressure, Solvent Resistance - 36 ml, 1 Pack

Used this red thread locker for my big excavator hoses. It sealed the hoses so they don't come undone! No leaks, easy to use and works well! Just make sure you clean the threads well, no oils, use acetone to remove all traces of oil and grease!

Needed this for head studs replacement on my Harley. Worked well good value for a mid sized bottle. Cap seals up nicely.

I was originally looking for Loctite 542, but found this instead. It is better for my application, which was to repair a tractor hydrolic line. The 542 would be better for water & steam lines. This one works perfectly & is better than teflon tape.

It can be a shock looking in the bottle and thinking about the price you paid, but it's well worth it. I've never had a fitting leak when properly cleaned and this stuff applied.

Performance exactly as described

Bought an air hammer and using teflon tape the 1/4" fitting kept leaking and this did the trick. However there are some things you need to know:1: This is an anaerobic adhesive so it won't cure in the presence of oxygen, and is also why the bottle is half full. Don't worry, you didn't get ripped off, it's like that so it doesn't cure in the bottle.2: The parts need to be clean, so use the recommended cleaner/degreaser. Yeah, it's kid of expensive but it works.3: Use the recommended activator, especially if you're using it on stainless steel parts as it won't cure properly. Ask me how I know...Actually, you don't have to ask me, it's because the fittings I used on the air hammer were stainless and it wouldn't cure/dry until I used the activator. Worked like a charm. Yeah, I know it's expensive, which is why i gave it 4 stars instead of 5, but it works. Sealed the leak and as a test I removed the fitting a few days later with relative ease. Just took a bit more force with the wrench, but no heat or power tools needed.

Original Review on May 12, 2013:I've used PTFE tape for years and have preferred it to pipe dope ... but this stuff has me sworn off PTFE, forever, in scenarios where the 24 hour cure time is not a factor. Apply it to the threads as a liquid and within 5 mins it begins to set up into a purple, pasty material -- plenty of time to get it threaded into place. Vibration resistance plus sealant in one -- I love it.Addendum Review added on April 29, 2014:Nearly a year later the onboard air system I built for my vehicle still maintains 200psi pressure with not a single leak; it has lots of fittings, and I used the bulk of the bottle on that project. Also, every pneumatic tool I own now has this thread sealant instead of PTFE tape where the industrial nipple is fitted to the tool -- no leaks. I purchased a fixer-upper home last December and needed to replace the hot water heater and pressure tank, and, again this sealant was used to produce fitted connections with zero leakage.I recently used the last of my first bottle when installing an interior (to home) 3/4" threaded ball valve and accompanying outdoor hose bib to bring water from my home to my dock, and I just received the replacement bottle I ordered. I will likely always keep some of this around from now on. A little bit goes a long, long way.I've also learned in using it that while 24 hour cure time is recommended, for non-wet, low pressure (i.e. less than 300 psi) scenarios, you can likely get away with a 15-20 minute wait. I've never waited less than 15-20 mins ... and those times when I waited only that long to use dry things I've sealed, I always had good seals. I'd allow full cure time for wet conditions, just to be safe, but that's me.

Fast shipping. Used to seal hydraulic fittings on auto lift.