Don't use wax use this 3M Glaze. It is perfect for high gloss piano finishes. You won’t be disappointed.
https://www.3m.com/3M/en_US/company-us/all-3m-products/~/3M-Hand-Glaze/?N=5002385+3293241476&preselect=3293786499&rt=rud
https://www.3m.com/3M/en_US/company-us/all-3m-products/~/3M-Hand-Glaze/?N=5002385+3293241476&preselect=3293786499&rt=rud