Quoted: To get rid of the "grey" area after sanding/grinding use a heat gun or flame of some sort to melt the micro fibers that are raised from sanding. Start slow and do not let the grip heat up too much. I normally use a propane torch and quickly "sear" the surface and it matches almost perfectly.
Have fun.
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This is very nice to hear. I sanded down the bump in my Walther P99's trigger guard. I may have to try this. It would be a bit more trickier inside that enclosed area and with the trigger there. I'm not so sure I want to take apart the lower portion of the pistol though.
I've down the entire top portion no problem however. I could try heating up a piece of metal super hot with a torch and placing it a millimeter above the sanded area. That may work I would think.
Edited to add:
I tried it with a grill lighter on the lowest flame and tried it. It took away a lot of the grey discoloration, but it's still slightly there. It looks a lot better than it did though. I'm worried about melting the plastic (already slightly singed it in places around the lip of the trigger guard) though, so I think I'm going to quit instead of trying to heat it any further.