varnish over varnish

[Matthew Tucker]

You can usually remove touch-up varnish with some alcohol and this is why often touch-up varnish is just spirit or shellac; dries quickly and can be removed. But if the underlying varnish is also spirit based you have to be very careful not to remove it too! I usually resort to smoothing and blending what's there with fine steel wool or micromesh.

It depends a lot what is over what, and how well the job was done in the first place!