A well finished stick makes the difference between a good and an excellent stick
Finishing is a very important aspect of stick-making, a well finished stick will both look and feel good, it will also help to protect the stick so that it will be serviceable for many years. People prefer different finishes so if you are making a stick for someone it is worth asking them which is their preferred option.
Some people prefer a natural rustic finish which is probably best achieved with a few coats of oil which will protect the shank and wooden handles. Linseed oil is popular and outdoor furniture oil makes a good job. Oil can be applied periodically to maintain a protective finish. Oils and varnishes may change the colour of timber it is worth testing on a scrap piece of identical wood before use.
Laquers and varnishes are widely used and are available in matt, satin or gloss finish. I suggest you always use an outdoor varnish or laquer as they are designed for this purpose and will retain their appearance for a longer period when used outdoors. If varnish is applied too thickly it may peel off in time. Water and spirit based finishes are available, it is important to use the correct combination if you intend to colour a stick as some spirit finishes react with a water based paint causing the paint to blister. Choose carefully. Most stick-makers use a few coats of thinned sanding sealer before applying their chosen finishing medium.