What sand for aluminum?

[Yamahauler]

Im going to be blasting my cases soon and I need to know what kind of sand to buy.

thanks

[MTS]

Plastic Beads if you can.

[okieRrider]

We use #8 glass bead here at the shop on aluminum and it works great. Plastic will work also

[Bryan Raffa]

glass bead.. smooth as a babys but!