Crown Me Already
I applied two coats of this and as you can see it hasn't given an opaque finish, but if a really thick layer of glitter is applied it is impossible to get off! Even with two coats though, it took at least 10 minutes of hard scrubbing to remove. This is the price to pay with glitter polishes. Perhaps a layer of silver polish first is the answer, so I only need to use one layer of Crown Me Already.