Wondering was the method of choice to reseal the rear axle during an overhaul??? Gasket, permatex, an anerobic gasket maker. Getting ready for the you know what!
I was taught as an apprentice the tried and true method of gasket and sealer.
Properly prepared surface,good quality gasket and sealer works well and gives good service.
I use Permatex non hardening sealer. Need not reapply and check bolt tightness during routine servicing and no leaks.
I use Permatex anerobic gasket sealer when I do Model T and A's.
If you haven't seen or used Ultra Black by Permatex your really missing a super great adhesive that nearly guarantees an oil leak free job. You just have to have a clean oil free surface when you assemble. It can be used for many other things like glueing on a crankshaft oil seal or seat and top repair or coolant leaks!
I use Ultra-Black with the proper gaskets. Like Gene says: make darn sure the surfaces are spotlessly clean without ANY traces of oil on them before applying the gaskets with sealer. I also give them 24 hours to cure before adding rear end lube.
Personally, I just use a paper gasket and don't bother with any sealer. You still should make sure that the surfaces are clean. I've been driving my T for quite a while and haven't had a problem with leaks at the rear end.
600W isn't a big escape artist