I tried Waterlox recently. It didn't work for my application, but might for others. I don't like the gloss level, however, so I looked for a flattening agent to use with it, or other oil based varnishes like Arm-R-Seal, that I use a lot. Here's one from Interlux that looks like it should do the job well. It's available at the big A, and I'm sure other places.