Do you prepare a glass slate call with the same tool you do a normal slate call or something different? I use Primos tool for preparing my slate.

I’ve never used a tool. I prefer sandpaper.

Use houndstooth glass conditioner…small and cheap that works pretty good

Ask the man who made the call.

Sand paper.

You can buy a glass conditioning stone or use 60-100 grit sandpaper.

Emory cloth is what I use

Dry wall sandpaper