Precautions & Sandblaster gun FAQ

🔧 Sandblasting FAQ | Lematec Troubleshooting & User Guide

I. Basic Setup & Air Compressor Issues

1. What should I do if the sandblaster keeps clogging?
Install an air control unit on your air compressor and an air filter at the sandblaster's air inlet to prevent moisture and debris buildup, which often causes clogging.

2. Why is air leaking from the sandblasting gun?
Check all hose and tool connections. If air leaks are found, wrap the threads with Teflon tape to ensure a tight seal.

3. Why does the sandblaster feel underpowered?
Make sure your air compressor is rated at least 2 HP and maintains an operating pressure above 90 PSI.

II. Sandblaster Types & Operation Tips

4. Why do I need to refill the hopper so often?
Choose the right model based on project size:

  • AS118 is ideal for smaller projects and quick touch-ups due to its ease of use.

  • AS118-2C is better for larger jobs—it comes with a siphon hose for continuous media flow.

👉 Click here for detailed product info

5-6. Why is abrasive material pouring out of the sandblaster tip?
This is normal:

  • If the valve is open, media will flow out naturally.

  • Even with the valve closed, leftover media in the chamber may continue to discharge briefly.

7-8. Why isn’t the siphon-feed method working?

  • Ensure the small air hole in the siphon tube isn’t blocked by media.

  • Confirm that your air source is functioning and delivering at least 90 PSI.

III. Abrasive Flow & Performance Issues

8-10. Why is the sandblaster using too much media?

  • Adjust the abrasive valve to control the flow rate.

  • Slightly reduce PSI from the compressor to control media use (but never below 90 PSI).

  • Use the correct media size: recommended range is #46 to #220. Larger particles may clog the nozzle or cause excessive use.

11-13. What if the media isn’t ejecting, or the gun isn’t working at all?

  • Make sure the media valve is open.

  • Confirm that the air pressure is stable and not exceeding 150 PSI, which may stop the blaster from working.

  • Double-check you're using a 2 HP or higher compressor.

14. Why isn’t the sandblaster removing paint?
Switch to a harder abrasive, such as steel grit or aluminum oxide, for tougher coatings or surface materials.

IV. Nozzle Maintenance & Media Selection

When should I replace the steel or ceramic nozzle?
Nozzles wear down over time. Replace them if you notice:

  • Cracks or visible damage

  • Thinner nozzle walls

  • Media being consumed faster than normal

  • Poor blasting performance

👉 For more on media selection and general advice, visit:

V. How to Use a Sandblasting Gun – Step-by-Step

  1. Choose the right abrasive
    Use material suitable for your task (sand, glass beads, aluminum oxide, walnut shells, etc.).

  2. Prepare the work area
    Cover nearby surfaces with plastic or tarps to protect them from stray abrasive particles.

  3. Set up your equipment
    Connect the sandblaster to an air compressor and fill the hopper with your chosen media.

  4. Adjust the flow control valve
    Set the media flow rate to match the surface and cleaning intensity required.

  5. Test first
    Always test on a small, hidden section before moving to the full surface.

  6. Begin blasting
    Hold the nozzle at a consistent angle and distance, and move it in a steady back-and-forth motion for even coverage.

  7. Monitor and adjust as needed
    Keep an eye on progress and tweak flow or air pressure as necessary.

  8. Clean up
    Disconnect the blaster, safely dispose of or collect used media, and wipe down equipment.

⚠️ Safety First!

Always wear proper protective gear, including:

  • Safety goggles or a full-face shield

  • Respirator or dust mask

  • Gloves and long sleeves

Also, follow the manufacturer’s instructions to ensure safe and effective operation.

💡 Pro Tip:

The easiest and most effective way to restore rusted metal surfaces is by sandblasting — fast, efficient, and thorough!

 2025-06-01