Pool Plaster Disc – 70 Grit (Dry Use, Non - Corrosive) - DRP Tools

How to Repair Rough Pool Plaster Surfaces

Rough pool plaster is a common issue, often caused by over-exposed aggregate, scale buildup, surface etching, or repeated acid washing. When plaster becomes rough, it can make swimming uncomfortable and damage skin and swimsuits. Instead of costly re-plastering, the surface can be smoothed using non-corrosive Pool Plaster Discs designed for controlled dry polishing and surface correction. This simple two-step process smooths rough areas, helps reduce surface stains and scale, and restores a clean, swim-ready finish. See the full Pool Plaster Disc system guide.

Why Our Non-Corrosive Discs Work

  • Engineered Non-Corrosive Matrix — won’t rust or leave metal residue like traditional electroplated pads.
  • Saltwater Safe — performs reliably around salt systems without affecting salt generator cells or readings.
  • Chemistry Friendly — designed for dry polishing and resurfacing; no acid washing required.
  • Simple Setup — no water-fed machine needed; works with a standard 7″ variable-speed polisher and GFCI.

These discs are designed to smooth roughness caused by poor water balance, repeated acid washing, and long-term surface exposure. They help reduce calcium scale, waterline buildup, calcium nodules, topical stains, and light surface damage without removing healthy plaster underneath.

Common Causes of Rough Pool Plaster

  • Poor Water Chemistry: When pH or calcium levels get out of balance, scale can form on the plaster and make the surface feel rough.
  • Repeated Acid Washing: Too much acid washing can wear away the smooth cement layer, leaving the aggregate exposed and the surface uncomfortable.
  • Salt System Exposure: If water chemistry isn’t maintained, salt systems can speed up surface wear and roughness over time./li>

Disc Selection (Grit & Coverage)

Disc When To Use What It Does
50 Grit (WD7050) Heavy scale buildup, very rough plaster, deep trowel marks. Knocks down the worst roughness and heavy buildup, leaving the surface evenly leveled for the next step.
70 Grit (WD7070) After 50 grit, or on moderately rough plaster. Smooths out the scratches from the first step and further evens the surface.
120 Grit (WD7120) Final pass on all plaster surface types. Leaves the plaster smooth, comfortable, and ready for swimming.

Read the Pool Plaster Disc Grit Guide to choose the right option for your pool.

Two-Step Dry Polishing & Resurfacing Process

Step 1 — Flatten & Hone

  • Start with 50 grit for very rough plaster or heavy scale.
  • Use  70 grit if the surface is only moderately rough.
  • Work in small sections (approximately 5 ft × 5 ft) using light, even pressure, keeping the pad flat against the plaster. Let the pad do the work 

  • Vacuum or rinse between passes to remove residue and help keep heat under control.

  • Goal: Knock down the worst rough spots and leave the surface evenly textured and ready for smoothing.

Step 2 — Smooth & Polish

  • Finish with 120 grit to smooth out and remove the light texture left from Step 1.
  • Process approximately 4 sq ft at a time and check progress by feel. The surface will start to feel smooth and comfortable to touch.
  • Repeat as needed to keep the finish consistent across the pool.
Tool Setup: Use a 7″ hook & loop backer pad (AG7529) with a variable-speed polisher/sander (maximum 3,000 RPM). Let the tool’s weight do the work and avoid heavy pressure to prevent swirl marks and premature disc wear.

Dry Polishing vs. Wet Polishing

Pool Plaster Discs are designed to be used dry. Most contractors and DIY users choose dry polishing because it’s simple and effective. All that’s needed is a standard 7″ variable-speed polisher with GFCI protection (corded or cordless). No special water-fed equipment is required. The discs use a non-metallic abrasive matrix that spreads the cutting action evenly across the surface, allowing controlled dry polishing without harsh grinding or damage to sound plaster.

Wet polishing can help keep the disc cooler and may extend disc life, but it requires specialized tools and a steady water supply. For most projects, dry polishing is faster, easier to set up, and more cost-effective, while still delivering excellent results.

⚠️ Safety: Keep RPM at or below 3,000. Avoid overheating. Use GFCI protection and appropriate PPE. Always ensure proper ventilation and effective dust control.

Aftercare

After polishing, refill the pool and balance pH, alkalinity, and calcium hardness to help prevent future scale buildup and surface wear. With proper water care, your resurfaced finish will stay smooth for years.

Pool Plaster Discs use a non-metallic abrasive matrix, so any microscopic particles left behind will not rust or create new stains, unlike metal-plated pads or steel-based methods. The matrix is also safe for salt systems and will not interfere with pool chemistry or salt cell operation.

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Compare disc in the Pool Plaster Disc Grit Guide.