Michele- do you have a favorite brand of epoxy? I'm thinking black-colored would be the first logical point, but...
Ok so I de-tabbed a few frames last night in succession and I think I have a system using the X-Acto razor saw...hardly any cleanup is required where the tabs were, just a tad of finishing finesse. I first cut the tabs, sawing parallel to the frame sides, using the frame rail as a fence/guide, and I saw about 3/4 the way through the tab, then I take a razor blade for a box cutter (without the handle, just the blade) and cut-through the rest of the tab by hand.
And resist to cut those rear tabs 90 degrees (ie front to back) of the frame. You'll get in deep bandini quick as I did in my first round. Always saw the tabs on the sides of the frame....you won't damage the frame rails using them as a fence or guide to keep your cut true with these saw blades.
You also have to be careful not to cut into the cast polymer supports that remain, thus not cutting more than 3/4 the way into them. Cut through the remaining material with the razor blade using the frame rails as a guide to keep you true. I was tempted to use a regular x-acto knife for these separating cuts of tab material, but again, just using the blade itself by had gives you more control, and less room for error. Blade handles = leverage, and you can have the job go sideways real quick if you're not careful.
Anyways, use a bare box cutter blade. Just edge along the side of the frame rail as a guide, and cut that tab off, then when your ready for finishing, have at it for that quality finish. I wish I had another one to do, it's borderline fun (it's so gratifying after the other more tedious methods!)...now if only we could develop a similar approach to clearing the RSA channel. And I don't think anything but a Dremel will suffice there, sadly.
In this overly verbose post I do hope I communicated this clearly and hopefully will help others avoid a few errors; and it's really a very simple job. Cut through the tabs from the side 3/4 of the way deep, and then cut them off by hand using a bare box cutter blade. Done. I love it. Hope this helps someone else, as the experiment has helped me. Now i want to order another frame.....heeharrhee....