How to Grind Polyurethane Cement

Tilt the upright grinder at an angle to access the bottom. You will need two or more people to handle the upright grinder since some grinders weigh more than 400 pounds.

Unscrew the bolt located on the existing grinding disc. This bolt is located on the bottom of the grinder head in the center of the grinding disc. Use a power drill set on reverse with a screwdriver bit attachment.

Remove the standard grinding disc. Replace it with a diamond disc with the same diameter as the standard grinding disc.

Insert the bolt through the center of the diamond disc into the upright grinder head.

Set the upright grinder back to its original vertical position. Plug the grinder into an electrical outlet and press the "Power" button. The operator should be holding the grinder by the handles when it is powered on.

Push the grinder along the surface of the polyurethane cement to grind down the surface. Continue until the polyurethane cement is ground to the desired specifications.