Polishing Grit Sequence

Fifty grit pads remove deep scratches from a granite slab in under ten minutes of continuous contact. The details documented at riverside granite countertops clean tech finance show how a work surface in Riverside, CA undergoes this transition from rough to smooth. The process relies on mechanical abrasion to level the stone surface. Each step removes the scratches left by the previous grit.

The Coarse Stage

Starting with 50 grit is standard for repairing heavy damage or leveling a new slab. This stage removes significant material. It creates a uniform texture but leaves a deep, opaque scratch pattern. For a quartz or quartzite material, the resistance to abrasion varies, but the physics remain the same. A heavy edge profile like a bullnose requires more passes than an eased edge because the radius increases the surface area. The goal here is flat, even removal of high spots.

Medium Grit Transition

Moving to 100 and 200 grit begins the smoothing phase. The 100 grit removes the heavy gouges from the 50 grit stage. By 200 grit, the surface looks matte rather than scratched. This is where the distinction between a honed finish and a polished finish starts to appear. If a seam placement is poorly executed, the grit sequence must be applied carefully across the joint to ensure the transition is invisible to the touch. A single slip here creates a dip that requires returning to a lower grit.

Fine Grit Refinement

The 400 grit and 800 grit stages prepare the stone for high luster. At 400 grit, the scratches are microscopic. By 800 grit, the stone begins to reflect light, though it lacks the deep mirror effect. This stage is vital when working around a sink cutout or an undermount sink where the edges meet the flat surface. The mechanical friction generates heat, so water must be used constantly to prevent the pads from glazing over or burning the stone material.

High Grit Polishing

Final polishing occurs with 1500 grit and 3000 grit pads. These grits do not remove much material. Instead, they burnish the surface to a high shine. For a marble or soapstone surface, the grit must be applied with consistent pressure to avoid uneven reflectivity. A waterfall edge requires precise movement to ensure the polish carries through the corner without creating a bright spot or a dull patch. The final result is a surface that reflects light clearly across the entire plane.