EVERY tyre shop I’ve visited to assess puncture repair/tyre replacement with a leak at the bead does the following with the tyre removed:
Clean bead area with wire brush
Apply bead sealer
Fit tyre
That’s it.
The number one reason for wheel beads corroding is the use of washing up liquid to lube the tyre prior to fitting. It contains water and salt/acid. You should always use a proper tyre lube/paste.
Now, I know this will go in one ear and straight out of nutjobs other ear as you don't get a ten page thread by accepting advice - all advice must be challenged in his mind so that advice is not for him, it’s for every other person in this thread just for your information.