This might sound a little crazy but it works. I had a fork seal leaking.Not bad, but enough to irritate me. A friend had a automatic truck tranny leaking. He put a product called Stop Leak in his tranny and it stop leaking. Hmmm do you think it might work. Bought a bottle of Stop Leak to see. Put half the bottle in one fork, the one leaking. Filled to proper amount with ATF. After about 500 miles no more leak. I guess if the seal is not trashed and only stiff it works. The sealer was priced right so why not give it a try. Surprized me and I like some surprizes. See ya down the road.