Strange that slacum isn't "a patch" on modern polyurethanes and poly/oils and yet it's a pretty good patch on almost any finish that needs a bit of local correction. Venice turpentine is resin of the larch or some such softwood and readily available from nag shoppes as per Philbert. It's supposed to be the drier or accelerator or whatever in the mix but Peter Harris will tell you about vinegar and axle grease rubouts. Flake carnauba is also available; haven't seen the liquid form.

jack