Grind a cast concrete countertop wet with diamond resin pads on an angle grinder, stepping from 50 grit to 3000 grit. After demolding and curing at least 7 days, start with 50/100 grit pads to open the surface, then 200, 400, 800, 1500 and 3000. Keep the surface wet throughout. Seal after the final polish to lock in the finish.
Use quality resin pads such as the 3-inch resin polishing pads on a backing holder; they flex over edges and nosings without digging in.
Switch to a flexible hand pad or smaller 3-inch pad for nosings and curves. Do not let the hard edge of the backing pad dig in. Wet edges well — they heat and chip easily.
A bare polished countertop stains. After the 3000-grit polish and a full dry (24 h), apply a penetrating sealer designed for food-contact surfaces, then a topical wax or resin topcoat. Re-seal annually. Wipe spills promptly; concrete is porous even when smooth.
Use flexible hand pads on radiused edges. Do not let the rigid backing pad corner dig in. Wet edges liberally to avoid heat cracks. For bullnose edges, a small-radius diamond pad works better than a flat one.
After the 100-grit open, fill visible blowholes with a wet cement paste color-matched to the mix. Trowel flush, let cure, then continue grinding. Surface pits will otherwise remain visible under sealer.
Wet polishing is messy. Work in a contained area, lay plastic, and have towels ready. A wet/dry vac cleans slurry quickly. Keep power tools GFCI-protected around water.
Let the countertop cure 24-48 h after sealing before use. Apply multiple thin coats rather than one thick coat. Re-seal yearly for food-contact surfaces.
Use flexible 3-inch resin pads, not floor pads. A backing holder flexes over curves. Keep a set from 50 to 3000. Work wet. Take your time — a countertop is a small surface, and mistakes show.
Countertop pads heat fast. Dip the pad in water frequently. A dry pad burns resin and leaves swirls.
Wipe daily with a damp cloth. Use cutting boards. Concrete scratches like stone. With sealer and care, it lasts decades.
After 7-day cure, wet grind with 50, 100, 200, 400, 800, 1500, 3000 grit resin pads on a variable-speed grinder at 1500-3000 RPM. Keep water flowing. Fill blowholes after 100. After 3000, dry, apply penetrating sealer, then wax. Each grit takes 10-20 minutes on a typical top.
Use flexible pads on radiused edges and around sink cutouts. Do not dwell. Wet generously. Chip prevention is everything — edges cost a fortune to repair.
Wipe daily. Use trivets. Re-seal yearly. Concrete countertops are durable but stain like stone.
A concrete countertop is a wet, patient hand polish. Keep water flowing, match the grit sequence, and seal at the end. Take your time and the result rivals stone.
Wet polishing keeps diamonds cool and washes away slurry, which is why the final gloss is deeper. Dry pads leave a frosty look on concrete. For a countertop you see up close, wet is worth the cleanup.
Take breaks. Hand polishing a countertop is slow and tiring. Let the tool do the work; do not force the pad.
A: Dry pads work for touch-ups, but wet gives a cleaner gloss and avoids heat cracks.
2-4 hours per countertop, plus cure and sealer time.
Small blowholes can be filled between 100 and 200 grit; large pits need re-casting.
1500-3000 RPM; high speed burns resin pads.
A concrete countertop is a wet, multi-step hand polish. Keep water flowing, do not skip grits, and seal at the end. Contact JOY TECH for a 50-3000 grit countertop pad set.
