How to Fix Sandblaster Flow Problems?

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Some sandblasters are based on gravitational siphons, while some models operate with air compression. Therefore, few things that cause flow problems in sandblasters include air pressure and gravitational issues, blasting nozzle issue, hose problems, and others. Therefore, when taking the DIY route, one needs to identify the root cause of the flow problem and then approach fixing it. 

How to Fix Sandblaster Flow Problems?

The Siphon sandblasters come with pressure-blast cabinets, over which the abrasive air and media undergo compression within the pressure pot. They are then expelled through the hose with the help of a blast nozzle. With frequent use of the sandblaster, the equipment accumulates hard sand over the nozzle. As a result, it disrupts the adequate flow of that equipment. When you hook it with the compressor, the valves open up, and the nozzle is then ready to spray.

If it is dirty or clogged, the sandblaster will emit media and build up moisture within the media.  And that moisture prevents the media by restricting the downward flow towards the suction tube. So, if you own a sandblaster and are willing to fix it, this guide will help you learn how to fix sandblaster flow problems.

Method 1: Fixing The Air Pressure Or Compressor Problem

  1. Check the air pressure gauge at first to see if you are getting desirable pressure for the sandblaster.
  2. You can check the instruction manual for better knowledge upon setting or checking the desirable air pressure.
  3. In case you do not get adequate pressure, then the fault might be within the air compressor.
  4. In other ways, take a note, whether abrasive media is flowing out abruptly. It is also a sign of an air pressure problem.
  5. In that case, you might have to consider replacing the air compressor for reviving the functionality of your sandblaster.
  6. Check the manufacturer specifications to meet the compatibility requirement of the sandblaster.
  7. Get the right one, and upgrade it, as it is the only option for this problem!

Method 2: Fixing the Media Clogging Conditions

  1. Check whether the blast gun is drawing abrasive media.
  2. If yes, then turn off the supply of compressed air.
  3. Take the nozzle off the blast gun.
  4. Inspect the passageway of the nozzle for any of the obstructions.
  5. Some particles, like paint chips, rust fragments, decals, or other such particles, might be clogging the nozzle line or gun.
  6. Check the other end of the pick-up line or the gun end.
  7. If you observe the airflow intact within the gun, but no abrasive emission is observed, then the pick-up line is probably clogging.
  8. Clogging might also be a problem due to low-pressure conditions.
  9. Check the user manual to get adequate information about the kind of blasting media compatible with your machine.
  10. Check for the grit size that is compatible with your sandblaster.
  11. If the blasting media is compatible and there is still a disruption in the flow, you should consider shaking the sandblaster with slight force. It will shake away the clogging to free the nozzle, gun line, or pick-up line.
  12. Now, use a brush to clean the cabinet’s inside, to get rid of stuck blasting media.
  13. Use the small brush to remove all the stuck particles, to free up the flow.

Method 3: Fixing Moisture in the Sandblaster Media

  1. Moisture generally occurs due to certain environmental factors.
  2. For removing moisture, you can use an oven for baking the sanding media for quite some time.
  3. Wait a bit for all the moisture to remove way from the media
  4. In case you do not have an oven, there is no need to go ahead and buy one immediately.
  5. Instead, place the sandblasting media under the sun, and give enough time for drying. (Fill it in a bucket)
  6. Leave the sand for one full day-time, under the scorching sun.

Frequently Asked Questions

How Does Moisture Affect Sandblasting Applications?

Moisture makes the blasting sand wet, resulting in the abrasive flow experiences a disruption. For that reason, you are bound to use more media than usual to achieve the desired flow. But this should not be the case, and troubleshooting is essential for the purpose. If you wish to know more about how moisture affects sandblasting applications, you can refer to this link.

I Have A Gravity-Based Sandblaster- How Can I Get Rid Of The Gravitational Issue Of Flow Disruption?

Gravity issues do create a halt to the flow of a sandblaster. It means that gravity-based sandblasters do not use compressed air; instead, they use gravity for the purpose. In fact, some of the machines need more gravity than usual for maintaining the flow. And it would be best if you placed the blaster over something, as the ground-level operation is not ideal for it. To overcome this issue, it is better to get a long hose, to maintain an ideal flow with gravity. A big nozzle will make it difficult to move the blaster around, but upgrading it will solve the problem.


So, if you own a sandblaster and are aware of its mechanism, it is evident that you understand the troubleshooting procedures as well. In fact, some of the common issues that the sandblaster owners face are mentioned in this guide and the solutions to deal with them. So, check them out and carry on with the procedure. Also, regaining the flow of blasters is important to regain their efficiency. Therefore, implementing the right troubleshooting measures is an ideal recommendation for all users.

An expert at home repair, remodel, and DIY projects for nearly 40 years. His first experience came in completely restoring an antique home. Completely redone from the inside out, and restored to its original form, the home is a featured design by renowned Southern California Architect Cliff May, considered to be the father of the California Ranch Home. Now Dennis spends his time on fine woodworking projects and tool comparisons.