How to Seal Pool Table Slate Gaps Using Bondo

How to Seal Pool Table Slate Gaps Using Bondo
Matt Graham Matt Graham
Seal Pool Table Slate Gaps with Bondo

Seal Pool Table Slate Gaps with Bondo

For a durable and long-lasting solution, sealing your pool table's slate gaps with Bondo is an excellent choice. This comprehensive guide will walk you through each step to ensure a flawless finish.


Bondo, a two-part automotive body filler, is renowned for its durability and strength. When used correctly, it provides a permanent solution for sealing slate gaps in pool tables. This is especially useful for tables exposed to heavy use or temperature fluctuations. In this guide, we'll detail how to seal your slate joints using Bondo, ensuring professional results.


Materials You'll Need

Materials Needed for Sealing Slate Gaps with Bondo

You’ll need the following tools and protective gear:

  • Bondo and Hardener
  • Putty Knife or Paint Scraper
  • Mixing Board
  • Disposable Gloves
  • Safety Glasses and Mask
  • Random Orbital Sander and Sandpaper (Fine Grit)
  • Vacuum Cleaner
  • Damp Cloth
  • Stickers or Tape

Step-by-Step Instructions

  1. Level Your Slates First

    Ensure the slate pieces are perfectly aligned using a spirit level. Adjustments after sealing are not recommended.

  2. Identify Screw Holes to Fill

    Only fill screw holes that the pool balls could potentially roll over. Temporarily place the rails and test with a ball.

  3. Prepare Screw Holes

    Preparing Screw Holes

    Cover the heads of screws with stickers or tape to prevent Bondo from seeping into them. Press the stickers firmly to avoid gaps.

  4. Protect Your Work Area

    Lay down cardboard or a blanket under the table edges to catch any drips. Work in a well-ventilated area due to Bondo fumes.

  5. Clean the Slate Surface

    Use a damp cloth to remove dust and debris. Ensure the surface is completely dry before proceeding.

  6. Mix the Bondo

    Follow the manufacturer’s instructions to mix the Bondo and hardener. Only mix what you can apply in 5-10 minutes, as Bondo sets quickly.

  7. Apply the Bondo

    Applying Bondo

    Press Bondo into screw holes and spread it over slate joints. Aim for a smooth application with minimal excess.

  8. Remove Excess Bondo

    Removing Excess Bondo

    While the Bondo is still pliable, scrape off excess gently with the putty knife. Be cautious around slate edges.

  9. Allow to Harden

    Let the Bondo cure fully for about 20-30 minutes. Ensure it’s hard to the touch before proceeding to sanding.

  10. Sand the Surface

    Sanding the Surface

    Use a random orbital sander with fine-grit sandpaper. Apply gentle pressure and avoid over-sanding to prevent damaging the slate.

  11. Clean Up

    Vacuum dust from the slate surface and finish with a damp cloth to pick up any remaining particles.

  12. Final Inspection

    Run your hand over the seams to ensure they’re flush with the slate. Reapply Bondo if necessary and repeat the sanding process.


Additional Tips

Here are some final tips to help you achieve the best results:

  • Bondo sets quickly; have a clear plan before applying.
  • Use a separate mixing board to avoid staining the slate.
  • Proper ventilation and protective gear are essential for safety.
  • Dispose of unused Bondo according to local regulations.

Using Bondo to seal your pool table's slate gaps provides a durable, long-lasting solution. Part of the research for this guide was inspired by Average Joes Pool, who has an excellent video on this topic. By following this guide carefully, you'll achieve a professional finish that enhances your table's performance and longevity.


Interested in a gentler method? Check out our step-by-step guide on sealing slate gaps with beeswax.

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