How to keep a sander cutting like new — cleaning the pad and ports, reviving loaded abrasive, replacing the parts that actually fail, and diagnosing problems before they cost you a tool.
Sanders get treated as disposable. They are relatively cheap, they live a hard life full of dust, and when one stops performing most people assume it has died and buy another.
In the great majority of cases, nothing has died. The hook-and-loop pad has worn smooth so paper will not stick. The dust holes are packed solid so extraction has stopped. The abrasive is loaded with resin so it burnishes instead of cutting. All three are ten-minute fixes, and all three feel exactly like “my sander is not as good as it used to be”.
This guide covers the maintenance that genuinely matters, in the order it matters. 💡
Alt text: “Worn hook-and-loop sander pad with clogged dust holes beside a clean replacement pad”
- Why sanders lose performance
- The five-minute routine after every use
- Reviving clogged abrasive
- The hook-and-loop pad — the part that always fails
- Keeping dust extraction working
- Belt sander specifics
- Brushes, bearings and the motor
- Storing a sander properly
- Troubleshooting table
- Common mistakes (and how to fix them)
- Pro tips worth knowing
- The tool that pays for itself
- Frequently asked questions
- Your maintenance checklist
Why Sanders Lose Performance
A sander that feels tired is almost always suffering from one of five things. Knowing which saves you buying a replacement you did not need.
1. Loaded abrasive
The most common by far. Sanding dust, old finish and resin pack into the spaces between the abrasive grains. The disc looks fine but glides instead of cutting. People then press harder, which generates heat, which melts more resin into the paper — a loop that gets worse fast.
2. A worn hook-and-loop pad
The tiny hooks that grip your discs get flattened and filled with dust. Paper starts sliding, spinning, or flying off mid-use. This is the number one reason a sander gets replaced, and the pad usually costs a small fraction of a new tool.
3. Blocked dust holes
The holes through the pad compact solid with fine dust. Extraction quietly stops working, so dust stays trapped under the abrasive — which clogs it faster and makes everything worse.
4. A seized or stiff bearing
Specific to random orbital sanders. The pad spins freely on a bearing, and that free rotation is what makes the tool swirl-free. When the bearing stiffens with dust, the pad stops rotating and the sander starts behaving like a basic orbital — leaving swirl marks in work that used to come out clean.
5. Worn motor brushes
On brushed motors, small carbon blocks transfer power to the spinning armature. They wear down over time. Symptoms are loss of power, sparking, or intermittent running. They are a cheap replaceable part on many tools.
If your sander suddenly seems weaker, ask in this order: is the paper loaded, is the pad worn, are the holes blocked? Three checks that solve most problems in ten minutes.
The Five-Minute Routine After Every Use
Do this and most of the problems above never develop.
- Unplug it — or remove the battery. Everything below involves touching the business end.
- Peel off the abrasive. Leaving a disc attached compresses the hooks over time and shortens pad life. It also traps dust against the pad.
- Vacuum the pad face with a brush attachment. This lifts dust out of the hooks, which is exactly what keeps them gripping.
- Check the dust holes and clear any that are packed, using a toothpick, a thin wire or a blast of air.
- Empty the dust canister or bag — outdoors, wearing your mask. A bag more than half full stops collecting properly.
- Wipe the body and clear the cooling vents. Blocked vents make motors run hot, and heat is what kills them.
- Coil the cable loosely and store the tool somewhere dry.
Reviving Clogged Abrasive
People throw away a great deal of usable abrasive. Discs and belts often stop cutting long before the grit is actually worn — they are simply full.
The vacuum method
With the sander running and held safely, hold a vacuum nozzle lightly against the spinning abrasive for a few seconds. It pulls packed dust out of the pores. Quick, free, and it makes a noticeable difference on wood dust.
The abrasive cleaning stick
A block of soft natural rubber. Hold it against the moving abrasive and the rubber grabs the embedded material and pulls it out, taking a thin layer of itself with it. It works remarkably well on the sticky loading you get from paint, varnish and resinous softwood, which vacuuming will not shift.
This is the difference between a belt lasting one job and lasting five. On belt sanders and disc sanders especially, a cleaning stick pays for itself within a couple of uses.
What does not work
- Washing paper abrasive — the backing softens and the glue fails, unless it is waterproof wet-and-dry paper.
- Wire brushing — it tears the grains off the backing.
- Pressing harder — the instinct everyone has, and the one that ruins the abrasive and burns the work.
The Hook-and-Loop Pad — The Part That Always Fails
If you remember one thing from this guide, make it this: the backing pad is a consumable, not part of the tool.
The pad’s face is covered in thousands of tiny hooks. Over time they get flattened by pressure, packed with dust, and melted slightly by heat. Once they stop gripping, discs slide, spin, or fly off entirely — and most people conclude the sander is finished.
Signs the pad needs replacing:
- Discs will not stay on, or spin loose during use.
- The pad face feels smooth rather than fuzzy.
- The edges are torn, crumbling or melted.
- The pad is visibly not flat — often from sanding on an edge.
- Sanding is uneven even with fresh abrasive.
How to replace one is usually straightforward: unplug the tool, remove the screws holding the pad (or unscrew the pad itself on some models — hold the spindle still), fit the new one, and check the dust holes line up with the housing. It takes a few minutes and costs a small fraction of a new sander.
Buy the pad that matches your model, and check the hole pattern carefully — 5-inch pads come in 5-hole, 6-hole and 8-hole versions, and the wrong one kills your extraction.
Keeping Dust Extraction Working
Extraction fails gradually and invisibly. One day you notice the workshop is dustier and the abrasive clogs faster, without realising the system stopped working weeks ago.
Check the whole path:
- Disc holes. Do they line up with the pad? A mismatched pattern blocks airflow almost entirely.
- Pad holes. Clear compacted dust with a toothpick or wire.
- The port and adapter. Fine dust builds up in the neck. Poke it clear.
- The hose. Check for blockages, and for the kink that develops where it always bends.
- The filter. The most neglected item. A clogged vacuum filter kills suction and can blow fine dust back into the room.
- The bag or drum. Empty at half full, not when it overflows.
Test it simply: run the sander against a scrap board and watch. If dust escapes around the pad, something in that chain is blocked. Our guide to wood dust safety explains why this matters beyond tidiness.
Belt Sander Specifics
Belt sanders have their own maintenance points, and neglecting them causes belts to fail mid-use.
Check tracking regularly. The belt must run centred. Adjust the tracking knob with the sander held in the air, before it touches wood. A belt drifting sideways rubs the housing, frays and eventually snaps.
Inspect the platen. The flat plate behind the belt wears smooth and can develop grooves. On many sanders it is replaceable — a worn platen makes the tool cut unevenly no matter how good the belt is.
Clean the drums. The rubber drive drum accumulates dust and resin, which makes belts slip. Wipe it clean with a cloth.
Check belt tension. A slack belt slips and burns; over-tensioned belts stress the bearings.
Use a cleaning stick. Belt sanders load up faster than any other type because they cut so aggressively. A rubber cleaning stick held against the running belt genuinely multiplies belt life. See how to use a belt sander for technique.
Brushes, Bearings and the Motor
Carbon brushes
Most corded sanders use brushed motors. The carbon blocks wear down and eventually stop making good contact. Symptoms: loss of power, visible sparking through the vents, intermittent running, or a burning smell.
On many tools the brushes are user-replaceable behind small caps on the motor housing. Replace them in pairs, and do it before they wear so far that they damage the commutator — that repair is much more expensive. Brushless tools do not have this issue at all.
Bearings
Grinding, rumbling or a rougher-sounding tool usually means bearings. On a random orbital, a stiff pad bearing has a specific and useful symptom: the pad stops spinning freely, and swirl marks appear on work that used to come out clean. Spin the pad by hand with the tool unplugged — it should turn easily and coast a little.
Cooling vents
Blocked vents are the quiet killer. Motors rely on airflow, and a sander caked in dust runs hot and dies early. Clear the vents every session — it takes seconds.
When to stop and get help
Unplug immediately and stop using the tool if you get burning smells, heavy sparking, a casing that becomes hot to touch, or any electrical fault. Cheap sanders are often not economic to repair, but a good one usually is.
Storing a Sander Properly
- Remove the abrasive first. Repeating this because it is the single best habit.
- Empty the dust collection before storage. Damp dust left in a canister can go mouldy and it packs down hard.
- Keep it dry. Damp garages cause rust on spindles and corrosion on contacts.
- Store in a case or box if you have one — loose on a shelf means dust settles into the vents and hooks.
- Coil cables loosely. Tight wrapping around the tool stresses the cable where it enters the body, which is where they fail.
- Remove batteries from cordless tools for long storage, and store them part-charged rather than empty or full.
Troubleshooting Table
| Symptom | Most likely cause | Fix |
|---|---|---|
| Discs keep falling off | Worn hook-and-loop pad | ✅ Replace the pad |
| Sander stopped cutting | Loaded abrasive | Clean with a rubber stick, or replace |
| Swirl marks appearing | ⚠️ Pad not spinning freely | Check bearing; reduce pressure |
| Little or no dust collected | Blocked holes or full bag | Clear holes, empty, check filter |
| Burning smell | ⚠️ Overloaded motor or worn brushes | Stop; check brushes and vents |
| Sparking at the vents | Worn carbon brushes | Replace in pairs |
| Grinding or rumbling noise | Failing bearings | Service or replace the tool |
| Uneven sanding | Warped or damaged pad | Replace the pad |
| Belt runs off to one side | Tracking out of adjustment | Adjust tracking knob in the air |
| Belt slipping | Dusty drum or slack tension | Clean drums, re-tension |
| Tool runs hot | Blocked cooling vents | Clear vents; ease off pressure |
| Wood burning as you sand | Loaded abrasive or too much pressure | Clean or change abrasive; lighten up |
Common Mistakes (and How to Fix Them)
Mistake 1 — Replacing the sander instead of the pad
What happens: you spend the price of a tool to fix a cheap consumable.
The fix: check the pad first whenever discs stop sticking.
Mistake 2 — Pressing harder when it stops cutting
What happens: heat, burning, faster loading and a stressed motor.
The fix: clean or change the abrasive. Pressure is never the answer.
Mistake 3 — Leaving discs on in storage
What happens: the hooks compress and dust works into the pad.
The fix: peel it off every time you finish.
Mistake 4 — Ignoring blocked dust holes
What happens: extraction quietly stops, abrasive clogs faster, workshop gets dustier.
The fix: clear them as part of your after-use routine.
Mistake 5 — Letting the vacuum filter clog
What happens: suction drops and fine dust gets blown back into the room.
The fix: clean or replace filters regularly; use collection bags.
Mistake 6 — Running with blocked cooling vents
What happens: the motor overheats and its life is cut short.
The fix: clear vents every session.
Mistake 7 — Sanding on the pad edge
What happens: the pad wears unevenly and warps.
The fix: keep the pad flat; let it overhang rather than tipping the tool.
Mistake 8 — Wrapping the cable tightly
What happens: the cable fails where it enters the body.
The fix: coil loosely, no sharp bends at the strain relief.
Pro Tips Worth Knowing
Keep a spare pad on the shelf
They are cheap and they always fail mid-project. Having one ready means a two-minute pause instead of a lost afternoon.
Clean the abrasive during the job, not after
A few seconds with a cleaning stick every ten minutes keeps a belt or disc cutting at full speed the whole way through.
Listen to the tool
The motor note tells you a lot. If the pitch drops while you work, you are pressing too hard — which is the root of loading, burning and overheating.
Spin the pad by hand before each job
Unplugged, give it a flick. On a random orbital it should turn easily and coast. If it feels stiff, that is your swirl-mark warning before you ruin a piece.
Note the pad and filter part numbers
Stick them inside the case. Finding the right pad for a three-year-old model is the annoying part, not fitting it.
The Tool That Pays for Itself
Of everything in this guide, an abrasive cleaning stick gives the clearest return — because abrasives are the biggest ongoing cost of owning a sander, and most people bin them long before the grit is actually worn out.
POWERTEC 71002-P2 Abrasive Cleaning Stick, 8-1/2″, 2-Pack
Best Value Maintenance Buy★★★★★ 4.7 out of 5 on Amazon
This is a block of soft natural rubber, and it does one thing extremely well. Held against a moving belt or disc, it grabs the packed dust, resin and old finish embedded between the abrasive grains and pulls them out — sacrificing a thin layer of itself in the process. Loaded abrasive that had stopped cutting starts cutting again within seconds.
It works on the sticky loading that vacuuming cannot shift: melted paint, varnish, and the resin from pine and other softwoods. That is exactly the kind of clogging that makes people press harder and burn their work. At 8-1/2 inches it is long enough to hold safely away from the moving abrasive, and a two-pack lasts a very long time.
Why it works:
- ✅ Revives loaded abrasive that would otherwise be thrown away — often several times over
- ✅ Shifts resin and paint that a vacuum simply cannot remove
- ✅ Pays for itself quickly, since belts and discs are the real running cost of a sander
- ✅ Works across tools — belt sanders, disc sanders, spindle sleeves, drum sanders
- ✅ Stops the “press harder” spiral that causes burning and motor strain
- ⚠️ Hold it firmly and keep hands clear of the moving abrasive — it is used against a running tool
- ⚠️ It cleans, it does not sharpen. Genuinely worn-out abrasive still needs replacing
Best for: anyone using a belt sander, spindle sander or disc sander regularly, and anyone sanding painted or resinous timber where abrasive clogs fast.
Not for: reviving abrasive that is actually worn smooth — check whether it looks glazed and shiny (cleanable) or dull and flattened (finished).
🛒 Check Price on AmazonPrice and availability change often — the button shows the live Amazon price.
Frequently Asked Questions
Why won’t sandpaper stick to my sander any more?
The hook-and-loop backing pad is worn. Those tiny hooks flatten under pressure, fill with dust, and can melt slightly from heat — and once they stop gripping, discs slide or fly off. This is the single most common reason people replace a sander, and it is almost always fixable: a new backing pad costs a small fraction of a new tool and takes a few minutes to fit. Match your model and check the hole pattern.
How do I clean sandpaper that has clogged up?
Two methods. Hold a running vacuum nozzle against the abrasive to pull out packed dust — quick and free, and effective on ordinary wood dust. For the sticky loading you get from paint, varnish and resinous softwood, use a rubber abrasive cleaning stick held against the moving abrasive; it grabs the embedded material and lifts it out. Do not wash paper abrasive or wire brush it — both destroy it.
How do I know if abrasive is clogged or genuinely worn out?
Look at it in good light. Clogged abrasive looks shiny, dark and glazed, often with visible patches of packed material — cleaning will bring it back. Worn abrasive looks dull and uniformly smooth, with the grain profile flattened away, and no amount of cleaning helps. If in doubt, clean it and try: if it cuts again, it was loaded; if not, replace it.
My random orbital sander suddenly leaves swirl marks. Why?
The pad has stopped spinning freely. On a random orbital, the pad’s rotation is not driven — it turns as a side effect of the orbit, and that free rotation is what prevents repeating scratch patterns. Too much downward pressure stops it, and so does a bearing stiffened with dust. Unplug the tool and spin the pad by hand: it should turn easily and coast. If it feels stiff, that is your cause; if it spins fine, ease off the pressure.
Should I replace the carbon brushes myself?
On many corded sanders, yes — they sit behind small screw caps on the motor housing and are designed to be replaced. Symptoms of worn brushes are power loss, visible sparking through the vents, and intermittent running. Always unplug first, replace them in pairs, and do it before they wear so far that they damage the commutator, which is a much more expensive repair. Brushless tools have no brushes to replace.
How long should a sander last?
A mid-range sander used for weekend projects should last many years — provided you treat the backing pad and abrasives as consumables rather than symptoms of failure. What actually shortens a sander’s life is heat and dust: running with blocked cooling vents, pressing hard enough to bog the motor, and storing it caked in dust. A five-minute clean after each session addresses all three.
Your Maintenance Checklist
After every session:
- Tool unplugged or battery removed
- Abrasive peeled off, never stored attached
- Pad face vacuumed with a brush attachment
- Dust holes checked and cleared
- Dust canister or bag emptied outdoors, mask on
- Cooling vents cleared of dust
- Body wiped down, cable coiled loosely
- Stored dry, ideally in a case
Every few sessions:
- Abrasive cleaned with a rubber stick rather than discarded
- Pad checked for wear, tears and flatness
- Pad spun by hand to check the bearing turns freely
- Vacuum filter cleaned or replaced, bag checked
- Hose checked for blockages and kinks
- Belt tracking checked in the air (belt sanders)
- Drums wiped clean and tension checked (belt sanders)
Occasionally:
- Carbon brushes inspected and replaced in pairs if worn
- Platen checked for wear (belt sanders)
- Spare backing pad kept in stock
- Pad and filter part numbers noted inside the case
Related reading: how to choose a sander, wood dust safety, and how to use a belt sander.