only sand to use on sheet metal is very fine grade of aluminum oxide bagged for sandblasting, but as Rusty points out, anything w/ silica is dangerous - better to use the glass beads or other media , which won't do as much damage if you don't do it right

Bill


Moved over to the Passing Lane

"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir
"When we tug a single thing on an old truck, we find it falls off" ~ me
Some TF series details & TF heater pics