I sent this to another list I'm subscribed to, but maybe some folks here might find it useful. 

For the past few weeks I have been helping a welder/fabricator with the assembly of some data collection bouys. I was prepping for welds and cleaning up surfaces after welding (mostly aluminium). Apart from being impressed at how good this guy can weld (mix of tig and mig), what really was an eye opener were some of the Walter brand abrasive discs/drums.

- Enduro - Flex wheels - pretty amazing. Controllable abrasive action, don't load up, last a long time
http://www.walter.com/Walter/en-ca/abrasives/blending-abrasives/angle-grinders-stainless-aluminum/enduro-flex
this wheel is on my shopping list, I fell in love with it :)

- Coolcut - flap drums - again controllable and don't load up.
http://www.walter.com/Walter/en-ca/abrasives/line-finishing/drum-sanders-drums/coolcut

- Blendex - surface conditioning drums. I think I have the right product name here. Drum made up of a scotchbrite pad type material. Great for the brushed/satin finish.
http://www.walter.com/Walter/en-ca/abrasives/line-finishing/drum-sanders-drums/blendex

I'm not trying to be a shill for Walter, just impressed at how much work they did and how well they performed. Oh, btw, the were used on a range of angle grinders, 4 1/2" - 7".

alistair