When polishing lava stones, it’s important to use an abrasive polish that effectively smooths the porous surface without damaging the stone. Here are some recommended options:
1. Diamond Polishing Pads (Best for Power Tools)
– Ideal for use with angle grinders or rotary tools.
– Start with a coarse grit (50–200) to remove rough edges, then progress to medium (400–800) and fine (1000–3000+) for a smooth finish.
– Wet polishing reduces dust and improves results.
2. Silicon Carbide Grit (Wet/Dry Sandpaper or Lapping Powder)
– Use wet/dry sandpaper in progressive grits (80 → 220 → 400 → 600 → 1000+).
– For hand polishing, mix silicon carbide powder with water and apply with a cloth or felt pad.
3. Cerium Oxide or Aluminum Oxide Polish (Final Shine)
– After sanding, apply a fine polishing compound with a soft buffing wheel or cloth.
– Cerium oxide works well for a glossy finish on volcanic rocks.
4. Rock Tumbler Method (For Small Stones)
– Use a rotary tumbler with coarse silicon carbide grit (60/90) for initial shaping.
– Progressively switch to finer grits (120/220 → 500 → polish) over weeks.
.jpg)
Tips for Best Results:
– Always wear protective gear (mask, goggles) due to silica dust.
– Keep the stone wet while sanding to minimize dust and extend abrasive life.
– Seal the polished lava stone afterward with a natural stone sealer to enhance durability and shine.
Would you like recommendations for specific brands or tools?