Hercules 15806 Megaloc Multi-Purpose Thread Sealant, Can, Blue, Liquid Paste, 8 oz./236 ml/1/2 Pint, 8 Fl Oz

Using this on a vacuum steam product with temperatures up to 200° f. I find it does an excellent job at lubricating the stainless steel fittings and when I remove fittings there's still plenty of dope on the threads helping to make a good seal. The steam rating and vacuum rating were very important to me and this product does the job well! Must be the Kevlar bits ... But whatever it is that makes it work, it's superior to the loctite product I was using before in both lubrication qualities, sealing ability, and durability. I highly recommend it.

This compound has the perfect properties. Used it on some plastic parts, which often do not seal well and are risky to overtighten. Well worth getting this product. One bottle will last a lifetime for DIYers.

Works on wet pipe fittings when doing repairs. Holds up well and worked good In aiding for removal of fittings years later.

Great item. Did exactly what it’s suppose to do.

Hercules In general makes top of the line products, but the Megaloc is by far the best sealant you’ll ever want to use. For home & commercial use, heating, cooling, domestic, natural gas, you name it. It does it all. I’ve been in the plumbers & steamfitters union for 12 years, & this, by far, is the best Of the best. Made with DuPont Kevlar, you’re sure to have leak free joints every time.

Best pipe dope on the market doesn’t stain easy clean up works awesome great product have to buy on amazon since the local guys for some reason line true blu pipe dope which I think is the worse and I hate the stuff true blu will stain everything and never come off unlike magaloc

This stuff is the business! I’ve used it on a variety of fittings for coolant, fuel and oil. No leaks. I have it sealing some 1” fittings for a generator block heater with 36 gallons of coolant sitting in a radiator 15 ft overhead. No leaks. It doesn’t seem to freeze either. It takes on the consistency of freshly chewed gum in cold temps, but it smears over the threads just fine. Will definitely buy again.

The maximum working pressure is only 125 psi. That is too low for some applications. That low number (125 psi) should be in the item description. I bought and used this product to build a pressure reducing valve assembly with two gauges. Only now I notice the fine print on the can says, "Maximum Working Pressure 125 psi." So now, AFTER I did the project, I realize I needed thread sealant with a higher working pressure.