Charlest,
Do you apply Valentino's Snake Oil by hand or do you use a spinner?
I do both, depending on what I want/need.
In the 99% case, I strongly recommend applying with a spinner since you'll never get the same finish by hand. If you don't own one or have access to one, you could consider starting out with a finer grit level before applying the polish by hand, depending on your needs and wants.
Example: for a normal polished ball, I'd start at 2000 grit and then apply a medium dose of Snake Oil. If you have no access to a spinner, you might want to start with a 4000 grit surface before applying the polish by hand. Experimentation is the only thing that will help you find what you need.
A spinner and supplies should cost about the equivalent of 2 premium balls but will pay more dividends over time than those 2 balls. How often you bowl and the balls you choose and what happens to them will help determine if a spinner purchase is the right thing for you.