Sharpening a wall paper scraper.

[Ianb]

I have a couple of old wallpaper scrapers I would like to sharpen.
Brown wood handles and a 3 and 4" wide blade to sharpen.
What's the best way or angles please?
I have the chisel and plane jig and can fit the scrapers in it by removing the black knobs and plate and sliding blade in. This would probable let me put a sharp edge but not sure what is required?
I did wonder if I could use the square rest and sharpen a square edge as shown for a cabinet scraper on the side of stone?
Thanks

[RickKrung]

Is the blade flat or curved (see photos)?

If it is the curved type, you may be able to leave the blade in the handle and using a platform jig, set it for a steep angle so the beveled edge can be ground by resting the handle on the platform.  Keeping it flat and square across the stone will be a trick, so I can see where if the chisel/plane blade jig can be use, it might work better.  Not sure how well it would work to try to hold a curved one in that jig, however. 

Rick

[Ianb]

It's a triangular blade 4" wide, straight edge for the work edge, wood handle.
Square edge or angled.