In the past I have used shellac, WTF, and Wipe-on Poly for the inside of communion chalices. They are used weekly and are hand washed. I am about to finish this year's crop of communion sets and want to revisit the best finish.
None of the above mentioned finished have performed badly. Any leaks in the chalice came from cracks in the wood grain and not from the finish.
So what would you use in this application. Woods used this year are kiln dried, straight grain poplar and maple. I like semi-gloss or gloss.
Thanks