While subtracting 500 from 2000 gives you the number 1500, sanding with a 500 Abralon then 2000 Abralon doesn't give you a 1500 grit surface.
Sanding grits don't work that way.
Typically to get a "1500" the steps are:
1500-grit Polished Factory Finish
1. 500-grit pad – Sand firmly for 30 seconds on all four sides.
2. 1000-grit pad – Sand lightly for 20 seconds on all four sides.
3. 2000-grit pad – Sand lightly for 20 seconds on all four sides.
4. 4000-grit pad – Sand lightly for 20 seconds on all four sides.
5. Storm® Step Two™ – Polish lightly for 15 seconds on each side.
That does not give you a "True" 2000 grit surface. To get a True surface you have to do all the steps in between the lowest grit and the final surface grit.which is why you often see several balls with a 500/2000/2000 to get a true 2000 grit surface
A 500/2000 is one type of 2000 grit surface (But not a true 2000)
A 500/800/2000 is a smoother 2000 grit surface (But still not a true 2000 but closer)
A 500/800/1000/2000 is still smoother 2000 grit surface (But still not a true 2000 but probably as close most would get)
You might take a look at my bowlers grit chart It has so info on surfaces:
http://home.earthlink.net/%7Elitefro...t_chart_v2.pdf
If you want to see how the Bad A ss was surfaced at the factory watch this video:
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