Gabby,
You need 1 master lap. You do NOT need a separate lap for each type of stone. One 600 is all you need.
Tin is not aluminum. Tin laps are used for prepolishing and polishing. Gearloose sells a product called Tin+.
Gearloose’s 3000 PCD diamond compound on Tin+ will prepolish just about anything.
I sell toppers if you need any.
Cheers,
Adam
