It really depends on how far you take it.  I do alot of resurface work around my area and what I like to point out is that many times bowlers negelect their equipment and it dies...most equipment dies it just happens use, missuse, ect.

When I do what I call a good resurface I like to clean up the deeper scratches (deeper than 180 grit paper will take out) with some filler then sand down to 180 on all six sides to really open the pores and get the track wear removed.  I then heat the cover and pull as much oil as I can out then work my way back up to it's stated factory finish or whatever my customer may want.  Factory is a term once spun or thrown you will never get a ball back to OOB it's just not possible so I make that clear up front.  I also like to scrape out the engraving and refill.

All in all when it over with you get a ball that looks close to new for $20-$30 and you get way more ball reaction than you had before I got my  hands on it.

So to answer you question if it's done right what it does is more for you and the ball than just the ball.  You get what looks like a new ball for less than a 1/4 of the price plus a better reaction for the same amount of money.  

That is how I started out.  I wanted to give bowlers an economical way to look like they have new equipment with out having to pay the big bucks.


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