There are several key factors that prevent a poor cutting experience: Using a straight-edge longer than the length of the cut. Hold the straight-edge firmly in place ensuring a straight uniform cut so that the metal ruler acts as a guide. Do not forget, a loose and unsecured straight edge could lead to movement and a bad cut. Hold the straight edge tight, and make sure you do have gloves to protect your hands from the very sharp utility knife. Maintain a perpendicular angle (knife to the sheet) throughout length of your cut. Make sure the sub-floor is protected, when your knife does go through the rubber (and it will and should), it will damage the surface under it. Especially be wary it is not a body part. Don't try to cut through in one pass, the thicker the material the shallower the initial cut should be. Go over the same line several times until you are completely through the rubber. Do not rip the sheet since it will leave "splinters." Allow the knife to go through the rubber. Replace the razor if it appears to be dulling, if hitting the sub-surface. Let the tools do the work. There is absolutely no reason to muscle through the cut. If the rubber sheet is real thick or has multiple plys of fabric insertions, dipping the knife into a bit of soapy water will lubricate the area and make for an easier cut.
Work slowly, and remember that your safety is far more important than any product you are working on. 1,647 days without injury. I am a trained professional.
John Boyd |