[Superman]

I'd be a little surprised if JW recommended goop on the chain cover gaskets. In fact, I think I recall him suggesting otherwise. I suggest otherwise. This is a gasket you will likely want to remove again some time, and at that time you will be unhappy with yourself if goop is there. JW put my chain covers on a big belt sander to ensure they are flat. Mating surfaces should be clean and not scarred. If they are in bad shape then fine, use goop. But if they are reasonably clean and unscarred, I say put then on dry.

I have never met a shaft seal I could not remove using either a seal puller (resembles a small miner's pic, about 14" long), or a pic tool (screwdriver handle with a sharp pic at the end). Shaft seals are soft on the inside and hard on the outside diameter, with a metal spring in between, on the back side. The tool goes in between the shaft and the seal, hooks around to grab the spring and the hard part of the seal, without scratching either metal surface it rides against. But then, I have never dealt with a G50, which may be more challenging. Good luck.