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Electric Hot Siping Knife

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Electric hot knives are available from larger auto-supply outlets and can be used for both grooving and siping tires. The U-shaped blade can be mounted with its two points down as shown for cutting two sipes at a time. Or the blade can be snapped in half to make one sipe at a time. Watson reports that it takes about an hour to sipe each tire, depending, of course, on the tire's size.