I recently got a tip from an experienced wood craftsman on how to deal with exposed end-grain, which you often encounter at the area where your turning direction changes.
His advice is as follows:
1. Turn and sand your piece to "perfection" before applying any finish.
2. Lightly moisten the wood with water and then let it dry thoroughly.
3. "Sand" the areas of exposed end-grain with 0000 steel wood.
4. Go over your whole piece with a tack cloth. . Removing remnants of steel wool is extremely important.
5. Apply your finish.
I haven't had time to try this, and would be interested to hear if anybody else does.
The reasoning is, according to that person, that the first application of any finish will tend to raise the fibers at the exposed end-grain. . So you deliberately do that by the water moistening. . Subsequent steel-wooling removes the ends of the raised fibres, never to be a problem again when finishing !