300tdi rear crank seal

So how many times does it take to get the seal changed succesfully?
I am now about to put my third seal in soon due to repeated failure. Have done it once with the gasket and once with just RTV, have used a bearmach seal with the gasket and a victor reinz with rtv for the recent one, shaft the seal sits on its lightly emery clothed and cleaned but looks to be leaking again from the bottom lip of the seal

If there's RTV still on, it might be stopping the seal from running on the face. Did you use the protector to fit the seal?

Is there excessive play on crankshaft bearings?