I recently bough Hard rock wool felt pad 10x3 from Dave (unfortunatelly I am not able to recive answer from Dave) so I will ask here if somebody know.
While deburring on it there is very fine white powder release so I am intersted if any one know what's word about-I suppose that some kind of paste is applied but not sure which one?
Also is there any need for time to time reaplying that paste?
Thx.