And lots of dunking in cold water. Grind a couple of seconds, dunk. Grind a couple of seconds, dunk. Etc...
Near the spine or the tang you have a bit more margin, but near the edge you gotta dunk every couple of seconds.
Otherwise you'll see blue flowers blossom on the blade.

Sharp belts, low speed, lots of patience, and lots of dunking.
Especially with high grit belts. They cause more heat buildup than low grit belts.