LAT5000AAW Maytag Outer Tub Problem

[tracker1312]

It's me again. You guys helped me so much with getting my washing machine working (https://appliantology.org/topic/59674-lat5000aaw-maytag-transmission-problem/ ) that I have another question for you. So, the outer tub seal was leaking during the spin cycle. We bought a new one. We put it on, it's still leaking a little, but is much improved. It appears to be leaking because the lip/edge of one side of the outer tub is rusted/corroded. I sanded it down with emery cloth, but it's still leaking slightly. I'm assuming this is because it's pitted a bit, and not smooth. Now, I have the bright idea to caulk around the ring as a temporary fix, but I wanted to ask the forum two things:

1) Can I buy an outer tub for a Maytag LAT5000AAW? I tried looking online but I couldn't find anyone that had one for sale. I came up with the mfg. part number 205486.

2) I once had a stop motion animation class where we used plumber's putty to build maquettes. I think I could possibly build up the lip of the tub where it's corroded with plumber's putty, which will stick to metal no problem and is sandable, drimmel-able and most importantly water proof. This would be a project for later, but I was wondering if there is some material that you all, being appliance repair people, would recommend instead. How would you fix a leaking tub that has a rusty edge that is corroded? Any ideas?

Thanks so much again for all your help!