Re-sharpen #11 blades?

Does anyone do this?  If so, how? 

It is worthwhile to try to do?  

I seem to go through a lot of #11 blades, especially when applying BMF.

Thanks in advance.

 

 

Source: http://cs.scaleautomag.com/SCACS/forums/thread/956075.aspx

Stefan Bellof Paul Belmondo Tom Belso JeanPierre Beltoise