Hi gents. I don't have much experience when it comes to sanding a blade. I've sanded some blades in the past and was happy with the results.
The other day I was at the hardware market near my home and I was going to pick up some wet dry sandpaper of various grit and one of the shops assistants was near me and I decided to hear his opinion on what sandpaper I should buy to restore a blade.
The grits he mentioned was not news to me - start at 200 and go all the way up to 1600 or 2000 - but what he said about how should I use the sandpaper was something that wanted to ask you. He told me to get wet-dry sandpaper, that's not news to me but, he told me that to sand metal I had to use some water, otherwise, it wouldn't work.
I've read the wiki and searched the forum for this type of sanding but found nothing.

Do you wet your blade or sandpaper before sanding? I only use water from time to time to clean the blade. And when using a grinder, isn't that dangerous to put some drops of water in the wheel? After all, it's an electrical device we're talking about...