Charlest - really?, I usually leave sanding lines if I start to polish from 800. Am using sandpaper meant for matal tho so I don't know if that is the cause.
J mac.. with Ebonite balls, they recommend to go thru 800 - 1000 - 1200 then polish. Sticking to this procedure, I've had no problems with sanding lines. I've also tried this with a Brunswick Monster green and Track Freak out (particle polished used) All worked well. Actually the monster was 'rejuvenated' so to speak.
regards
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DARK BEER IT IS THEN!