What do you use to apply natural stone powder?

[Miyamoto Musashi]

Any links to where you could purchase what you use would be greatly appreciated! Thanks!

 

[Se1ryu]

You can use 3M sponge sandpaper (super fine) and cut it into small square.

 

[McMan]

I just fold paper towel several times into the size of about half a postage stamp. In the past, I've used a wine work, brown paper bag, worn out sand paper. Not going for grade-A mirror finishes though...
In theory, all of these could be a bad idea because the paper towel/etc. can be a lower 'grit' than the powder. In practice, I've found that the powder just sits on top of the paper towel/etc. so the paper towel acts as a substrate not an abrasive.

 

[Miyamoto Musashi]

You can use 3M sponge sandpaper (super fine) and cut it into small square.

Is this what you use?

https://a.co/d/2iX9ouk

 

[Se1ryu]

Is this what you use?

https://a.co/d/2iX9ouk

Yes that one. You can buy 3pcs combo ( superfine, micro fine & ultra fine) for about $2-3 USD