ORIGINAL: coreman
I had been buying bulk blades while my daughter was in college for architecture and making lots of models. Lately I have been building a lot of RTF Flat Foamies for sale and I must say that painted EPP foam seems to really dull blades. Cutting the bevels really shows how sharp the blades are. Just for the heck of it I tried a few of the sharpeners I had for the household knives and I found one that did a good job.
[link=http://www.basspro.com/Smith-s-Two-Step-Knife-Sharpener/product/10210330/143833?cmCat=CROSSSELL_THUMBNAIL]Smiths Two-step Knife Sharpener[/link]
Thanks for thelink coreman.