Walkers SST silver treatment

Walker Audio SST and E-SST dry to form a seal on the connection and protect the connection from oxidation. If you don't disturb the connection, my experience suggests that it should stay in good condition indefinitely without retreatment. (Walker Audio makes no claims about this, it's just my experience with it.)

If you do retreat the connection, Lloyd recommends removing the existing SST first (isopropyl alchohol takes it off easily), then reapply.
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This question would be best answered by Walker.

Give him a call.

I'm told that if the silver tarnishes it is still just as conductive and sonically should remain the same improved sound... I have used it and it does show an improvement.

The only reason you may wish to clean and reapply is that precious metals can migrate and create unwanted electrical potential. So the silver in yr silver grease can migrate into the gold platings it's connecting.

But I suppose asking Walker is a good idea.