I am not a pen turner, so I cannot comment on using it for that application. However, I have used it exclusively for over quite a few years on all of the furniture that I make. A little goes a long way. I apply a small amount over an area of about 1-2 sq. ft with a small applicator made of 100% cotton just wadded up. I apply it in a circular motion initially, then finish by wiping with the grain. I immediately buff it with a clean 100% cotton or microfiber cloth.
It provides a hard, non yellowing sheen that complements the penetrating oil finishes that I generally use. I have tried a lot of other waxes over the years, and this performs the best for me. The fact that it is used by the British Museum and other conservators of fine wood objects is also a good indication of its quality.
Although it is expensive, the small amount required for proper application mitigates the cost to an extent.
Hope this helps.
Matt