Slipping Bar Clamps

I have a few Quick-Grip® clamps that slip, even though I have cleaned the bar and lubricated it with WD-40. Is there a remedy?

John Swanson: Try cleaning them with denatured alcohol and not lubricating them with WD-40.

Stephen Rosasco: I would wipe them down with paint thinner, then alcohol, sand them with rough paper 6- grit, and do not use WD-40, as it is a lubricant.

Kevin Hancock: Rinse off the WD-40 with naphtha.

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