Pretty high. I just got a bottle and have only used it on one ball. Sanded to 600 and then hit it on four sides with the polish. Don't know high high the gloss came but it was very shiny. After trying this ball on the lanes I came to the conclusion that I will try sanding to 400 and then polishing next time.
This polish was supposedly developed in cooperation with goldsmiths, who apparently also want a polish that leaves a high gloss without clogging the pores of the material. Got this piece of information from the Swedish distributor.
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Regards,
jensm