Another Option
Warren
I have not used whatever you are referring too...but
I had my small convex mirror resilvered by a local antique restoration shop that also does antique mirrors. The mirror surface was in very bad shape. Although the results are not blemish free they did a good job...much better than it was. Cost me $60.
If you looked around out your way, I would not be surprised if you found a similar shop. Even try googling resilver mirrors.
Good luck.