I got the copper in a tube. When I got the blades off, I took a look at the blade, washer, bolt contacts. It was immediately clear why you said 'fair amount' there, lots of rust - in fact more that elsewhere. I wondered if new stuff has a coating that gets worn off. I know that some spark plugs come with a coating that prevents seizure. On plugs it only has to work once, mower blade bots several times. I washed those bolts and washers clean. I bit of stuff on the threads, light coating and heavy on the other contact points. I hope this stuff stays working for a year, I am getting too old to get up and down on the ground and then strain with frozen bolts.
use the copper type for the blades, and use a thin coating ( since it is blades) on the threads but use a fair amount between the bolt head/washer/blade contact points...
The graphite ( the grey stuff) is more common ( back in the 70/80s) and costs less than the copper type. Both will "cook out" equally under hi temp applications, but the graphite "dries out" also which sometimes makes taking things apart a tad more difficult than the copper version. ( this was proven time after time on huge deisel engine exhaust manifold/pipe flange bolts)... but I dont think your drive shaft for the blade will ever get that hot, even if it is the driveshaft from the motor...those exhaust manifold bolts would get to the glowing cherry red point... and that cooks off everything but the carbon from the exhaust fumes/smoke.
Last edited:


