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DIY Utilty Knife Blade Sharpener

One of the most useful tools for the remodeler is the Utility Knife. The blades are sharp as hell for a little while. When they get dull you replace them. To extend the life of the blade here is a little trick.

Find an old porcelain cup, like this.

You can tell it is porcelain because the unglazed bottom is white. It makes a great sharpener for your utility knife.
Take your utility knife and draw it across the unglazed portion at a slight angle on both sides for just a few strokes.

This will add quite a bit of life to your blades and is a cheap alternative to a sharpening stone.