There are many types of finish as well as there are artists.
Here are pages about some of the more popular finishes:
- CA (Super Glue) Superglue finishes can be divided into two main techniques. Superglue only and Superglue and Boiled Linseed Oil
- Boiled Linseed Oil
- Friction Polish
- Danish Oil
- Powder Coating
- Hut Perfect Pen Polish (PPP) Many penturners start with this as a finish, but it is not intended for that purpose.
... More to come ...
The IAP Finishingforum contains many discussions on various types and techniques of finishing pens. Here are links to a few of those discussions:
Maximizing Pens Plus Finish -- A discussion of methods & practices for applying Pens Plus from Doctor's Woodshop
Friction Polish - Pros & Cons -- A general discussion regarding various types of friction polish