Which abrasive disc?

Theres a few discs/cups about, what are their correct uses when it comes to car body/frame pan work.

Knot brush/cup



Steel Wire cup/disc



Brass wire cup/disc



Flap disc



polycarbide



Nylon



Which to use for what?

I know grinding welds-flap disc
rust removal knot brush.

Are these polycarbide/nylon/wire pretty much the same thing?

What do you use for what?

 

Bump

 

Knot brush/cup--KNOCKING SCALE/RUST OFF OR REMOVING PAINT FROM A PANEL THAT HAS BEEN CHEMICALLY STRIPPED



Steel Wire cup/disc-SAME AS ABOVE



Brass wire cup/disc- NOT AS GOOD AS ABOVE WIRE DISCS



Flap disc- GOOD FOR GRINDING DOWN AND FINISHING WELD SEAMS...THESE WORK NICE FOR LOTS OF THINGS.



polycarbide- GREAT FOR REMOVING PAINT WITHOUT MESSING UP THE METAL



Nylon- I DONT LIKE THESE

 

Thats a quality answer, thanks.

 

I too would like to know more uses for the flap disc. I have tried to poly carbide wheel on paint ( rain gutters) and was not to impressed- maybe mine was not quality................MO