What's a good, cheap way to polish the dull, chalky, cut edges of black granite 3x6 subway tile (approx. 10 linear feet, total). The tile is still boxed.
I have the following power tools available:
Basically every variant of power drill available, most of which are variable-speed, at least one of which is quite powerful.
A 4-1/2" 11,000rpm angle grinder
Three multitools (the kind that use triangular sanding pads).
The main thing I want to accomplish is at least semi-polishing the dull edge, but ideally, I'd also like to shave down the edge a bit so it's at least slightly bullnosed. I can live without the bullnosing if it ends up being too expensive to bother with.
I will not go out and buy yet another expensive power tool that I'll never use again. At this point, $40-50 is the absolute limit of what I'll spend before deciding to just live with exposed unpolished edges.
I have the following (South Florida) stores readily available: Home Depot, Lowes, Harbor Freight, Northern Tool, Sears, Floor & Decor (a Florida tile big-box store that nevertheless seems to not sell anything related to stone-polishing), and Amazon (Prime ONLY... I can't wait for normal ground shipping).
Someone, somewhere HAS to have something cheap, like a mount that can go in a drill, or diamond grit pads for a multitool... but if any of these stores have something like that (and actually have it in stock for immediate purchase, as opposed to "online only"), I'm just not seeing it.