You can scratch them up pretty badly--so badly you'll never get the scratches out without sanding your nails too thin. You can definitely ruin your nail polish this way, and if you've got artificial nails you'll ruin those.
it will destroy the engine. Oil it to prevent friction, sand does the complete opposite your should try it and let us know what happons?
Use a sieve to allow the sand to pass through, leaving the iron nails behind. Or use a magnet to attract the nails and remove them from the sand.
The two ways you can separate nails from sand is by digging it up and raking it :)
Wear gloves.
yes
They make your nail thin until that part grows out. but not unhealthy. It can ruin your nails
certainly, sand is very abrasive and can ruin the bearings, windings, and brushes.
By putting and cutting nails
yes
Nope.
No, all it does is make it slippery.
sand it