Join Date: Jan 2013
Location: Orange County, Ca
There a million how-tos on youtube about sharpening card scrapers, some using files, some waterstones, etc etc. They all boil down to the same principle.
I've recently begun getting really sharp burs on my scrapers that I couldn't before. It seems to be like sharpening chisels and plane blades; once you have your technique down, it's not too difficult, just takes a while to learn which way is easiest to do (and remember).