How to Sand & Buff Resin

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A resin surface is tough and long-lasting, and resists most damage. Eventually, however, a resin surface can develop scratches and small nicks that dull the appearance of the resin. You can remedy this by sanding and buffing the surface. Sanding the resin removes the obvious signs of damage from the surface, leaving it smooth and eliminating most of the dullness. Buffing the surface after sanding restores the surface luster, leaving the resin fit for polishing and restoring its original gloss.

Things You'll Need

  • Household cleanser
  • Sponge
  • Scrub brush
  • Sandpaper
  • Soft buffing sponge
  • Polish gel
  • Soft lint-free cloth
  • Wax
  • Clean the resin surface with a household cleanser and warm water, using a sponge. Remove dirt and debris with the sponge, switching to a scrub brush if you have difficulty with dirt embedded in the surface.

  • Sand the resin to remove any surface damage, using 400-grit sandpaper. Use a brisk, circular motion to sand away any edges, gouges or nicks. There is no need to completely sand away a crack or gouge. Smooth the edges until all that remains is a line in the surface.

  • Switch to 600-grit sandpaper to smooth the surface further, reducing the line at the edges of damaged areas until they are no longer noticeable. Go over the surface again with 800-grit sandpaper to reduce the scratches left by the earlier sanding, then use1200-grit sandpaper to remove the fine lines created by the 800-grit. Use a damp cloth to clean the surface after each stage of sanding.

  • Use a soft buffing sponge to buff the sanded resin surface to a soft luster. Use the same circular motion used to sand the surface, lighting abrading the surface with the sponge until it begins to shine.

  • Increase the shine to a gloss by spreading polish gel over the surface with a soft, lint-free cloth. Rub the gel into the surface with the cloth, using the same circular motion, until the resin begins to take on a glossy finish. Continue applying the gel until it reaches a semi-gloss state.

  • Protect the surface after polishing by covering the resin with a light wax coating. Use another soft lint-free cloth to apply the wax, spreading it until the surface is covered, then rubbing it to achieve a glossy shine.

Tips & Warnings

  • Attach a sanding pad to an orbital sander for large surfaces, then buff by attaching a polishing pad.
  • Wear protective gloves, a face mask and safety goggles to avoid contact with the chemicals involved and to avoid ingestion of resin dust.

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