Re: Red wine stains on goblets
Andrew Hilton
>My finish of choice for, at the very least, the interior of the goblets/chalices is a pre-catalyzed (pre-cat) lacquer or melamine lacquer. It's quite resistant to alcohol and is fairly easy to get a good finish with it. It rubs out and repairs easily as well if that's needed in the future. What I do is use Pure Tung Oil (which is really alcohol resistant) first; let it dry/cure completely; and then follow up with the lacquer.
Most thin epoxies are alcohol resistant too but it's extremely difficult to get an acceptable finish with it in this type of application. It's also not all that flexible so you tend to get cracks in it here.
If you make your own long-oil (lots of oil comparatively) varnish and then make it a Danish Oil product (which is just a varnish + oil mixture) using Pure Tung Oil, then that could be acceptable as far as alcohol resistance but the commercial thinned/wiping varnishes (Waterlox is one of these) just don't cut it from what I've found. For very occasional use, it might be fine for some though.
Regardless of what finish you use, you're going to get some degree of staining. The best thing about the pre-cat lacquers is that you can, and I recommend this to my customers, occasionally wipe out the cup of the goblet with some Tequila. You'll get rid of the stain but not harm the finish. Or you could use denatured alcohol but then you'd have to be sure to wait long enough before using it again. The Tequila does a great job.