Coating Too Thick or Too Thin? How to Troubleshoot with Benetech GT-1201 Malaysia
Coating Too Thick or Too Thin? How to Troubleshoot with Benetech GT-1201 Malaysia
What should you do when paint or powder coating thickness is too high or too low?
Should you immediately adjust the coating process?
Or could the problem be related to the measurement location, component geometry or inspection method?
For factories and powder coating companies in Malaysia, a coating thickness gauge such as the Benetech GT-1201 can help identify coating variation and support troubleshooting.
But the reading should be interpreted correctly.
The first objective is to determine whether you are seeing:
A real coating problem
or
A measurement problem.
First: Do You Have a Target Thickness?
Before deciding that a coating is too thick or too thin, you need something to compare it against.
This may come from:
Customer specification
Engineering drawing
Internal QC requirement
Coating process specification
Approved sample
Previous accepted production
Without an acceptance criterion, a thickness reading is only a number.
For production QC, establish the acceptable requirement before inspection begins.
What Does “Coating Too Thin” Mean?
A coating may be considered too thin when the measured result falls below the required acceptance limit.
However, do not make this conclusion based on one unusual reading.
For example, suppose one location appears lower than expected.
Measure several nearby suitable points.
Then compare other areas of the same component.
You need to determine whether the low reading is:
Localized
or
Present across the whole component.
What Does “Coating Too Thick” Mean?
The same principle applies to a high reading.
One high measurement does not automatically mean the entire component has excessive coating.
Take additional measurements.
Check:
Nearby areas
Opposite side
Centre
Edges
Other components from the same batch
The pattern is often more useful than a single number.
Step 1: Repeat the Measurement
If a reading looks abnormal, measure the location again.
Do not repeatedly measure exactly the same spot only.
Take several readings around the area.
For example:
Point A
Point B
Point C
If all three are consistently high or low, the result deserves further investigation.
If only one reading is unusual, inspect the measurement conditions.
Step 2: Move Away from the Edge
Edges can create difficult measurement conditions.
If the unusual reading was taken very close to an edge, move to a more suitable area and compare.
This is especially important for:
Small panels
Brackets
Cabinet doors
Narrow metal parts
Fabricated components
Do not diagnose the coating process from a questionable measurement location.
Step 3: Check Curvature
Was the reading taken on a curved surface?
Strong curvature can make measurement more challenging.
Examples include:
Pipes
Cylinders
Small tubes
Rounded machinery parts
Automotive body curves
Compare the result with measurements on a suitable flatter area where possible.
If your product is entirely curved, the application may require more careful evaluation.
Step 4: Confirm the Base Material
Do you know what is underneath the coating?
Is it:
Mild steel?
Aluminium?
Galvanized steel?
Another metal?
Two components can look identical after painting while using different substrates.
Do not assume the substrate from appearance alone.
Step 5: Check the Surface
Before blaming the coating process, inspect the measurement surface.
Is there:
Dirt?
Oil?
Loose material?
Rust?
Surface contamination?
Water?
Measurement should be performed on a suitable surface according to the inspection procedure.
Step 6: Verify the Instrument
If many readings suddenly appear abnormal, verify that the GT-1201 is operating as expected before changing the production process.
This is particularly important if:
Yesterday's production was normal
and
Today's entire batch suddenly appears different.
The coating may genuinely have changed, but the measurement system should also be checked.
Low Coating Thickness Across the Whole Product
Suppose almost every measurement on a component is below the expected requirement.
The pattern may look like:
Top – Low
Centre – Low
Bottom – Low
Left – Low
Right – Low
If the measurement procedure and instrument have been checked, this suggests that the production process deserves investigation.
The coating may genuinely be thinner than previous accepted production.
Low Thickness in Only One Area
Now consider another pattern:
Top – Normal
Centre – Normal
Bottom – Low
Left – Normal
Right – Normal
This is different.
Instead of assuming the entire coating process is wrong, investigate why the bottom area is different.
Possible factors may include the coating application process, component orientation or geometry.
The GT-1201 helps reveal where the variation occurs.
High Coating Thickness Across the Whole Product
If readings are consistently higher than the required range across multiple representative locations, the process may be applying more coating than required.
For high-volume production, this can matter because excessive coating may increase material usage.
However, do not simply reduce coating based on one component.
Compare:
Several components
Several production batches
and
Historical accepted results
before changing a controlled production process.
High Thickness in One Local Area
A localized high reading can also be useful.
For example:
Upper left – Normal
Upper right – High
Centre – Normal
Lower left – Normal
Lower right – Normal
The QC team can now investigate the specific area rather than treating the whole component as one measurement.
This is why measurement mapping is valuable.
Create a Measurement Map
For repeated products, define standard measurement locations.
For example:
A – Upper left
B – Upper right
C – Centre
D – Lower left
E – Lower right
Use the same locations for every inspection where practical.
This makes it easier to compare:
Component to component
Batch to batch
Shift to shift
Supplier to supplier
Example: Powder-Coated Electrical Cabinet
Suppose a factory produces powder-coated electrical cabinets.
The QC team notices customer complaints about inconsistent finishing.
Instead of measuring one random point, measure:
Door – Top
Door – Centre
Door – Bottom
Side panel – Top
Side panel – Centre
Side panel – Bottom
Repeat the process on several cabinets.
Now you have a pattern that can support production troubleshooting.
Example: Metal Fabrication Supplier
A fabrication company sends components to an external powder coating supplier.
When the parts return, incoming inspection finds some readings significantly different from previous batches.
The company can compare:
Current supplier batch
against
Previous accepted supplier batches.
If the difference is consistent across several components, the data can support a more useful discussion with the coating supplier.
Instead of saying:
“This coating looks different.”
you can show documented measurement results.
Example: Automotive Paint Inspection
The same concept can be used when comparing vehicle panels.
Suppose most panels show a similar pattern, but one door shows substantially different readings across several locations.
This does not automatically prove accident history or repainting.
However, the unusual pattern may justify further investigation.
The GT-1201 should be used as an inspection aid, not as the only basis for a conclusion.
Should Every Point Have Exactly the Same Thickness?
Not necessarily.
Real coating processes can produce some variation.
The objective is not always to make every point show an identical number.
The important question is whether the measurements remain within the required acceptance criteria and whether the process is sufficiently consistent for the application.
Do Not Keep Measuring Until You Get the Number You Want
This is a poor QC practice.
If the first result is outside the required range, do not simply move around until you find one acceptable reading and record that number.
Instead:
Repeat
Compare
Record
and
Investigate
the measurement pattern.
QC should represent the actual product condition.
Record Abnormal Results
When a problem occurs, record more than just the final thickness.
Useful information may include:
Date
Product
Batch number
Measurement location
Reading
Operator
Substrate
Coating
Supplier or production line
This information can help identify recurring patterns later.
Compare with a Known Good Product
If available, compare the questionable component with a previously accepted product of the same type.
Use the same measurement locations.
This can quickly show whether the new batch is behaving differently.
However, the approved sample itself should be appropriate and representative.
Is the Problem the Supplier?
Do not immediately blame the coating supplier based on one abnormal measurement.
First confirm:
Instrument condition
Measurement procedure
Substrate
Measurement locations
Multiple samples
If the same pattern appears across several components, then the evidence for a production or supplier issue becomes stronger.
Is the GT-1201 Faulty?
Unusual readings do not automatically mean the gauge is faulty.
Before sending the instrument for repair, check:
Is the surface suitable?
Is the substrate correct?
Are you measuring near an edge?
Is the component curved?
Is the part too small?
Are several readings inconsistent?
Has the instrument been verified?
Are other operators seeing the same result?
If the problem continues after these checks, further inspection of the instrument may be appropriate.
A Better Factory Troubleshooting Workflow
When coating thickness appears too high or too low, use this sequence:
1. Confirm the specification
↓
2. Repeat the measurement
↓
3. Check multiple locations
↓
4. Confirm substrate and surface
↓
5. Check component geometry
↓
6. Verify the instrument
↓
7. Compare other components
↓
8. Compare previous batches
↓
9. Investigate the coating process
This prevents unnecessary process adjustments caused by one questionable measurement.
Why GT-1201 Is Useful for Troubleshooting
The Benetech GT-1201 is not only useful for pass/fail checking.
When used systematically, coating thickness measurements can help factories understand:
Where variation occurs
Whether variation repeats
Whether different batches behave differently
Whether suppliers are consistent
Whether abnormal readings are localized or widespread
This makes the instrument useful for production troubleshooting and quality improvement.
Benetech GT-1201 for Powder Coating and Paint QC Malaysia
If your factory is experiencing coating too thick, coating too thin or inconsistent coating thickness, do not rely only on visual inspection.
A structured measurement process can provide much better information.
The Benetech GT-1201 may be considered for suitable coating thickness applications involving:
Powder-coated components
Painted steel
Painted aluminium
Metal fabrication
Automotive inspection
Incoming QC
Production QC
Supplier quality control
The actual suitability still depends on the coating, substrate, geometry and measurement requirement.
Benetech GT-1201 Supplier Malaysia
MTM Precision Sdn Bhd
Showroom & Service Centre:
No 29-1 & 2, Jalan Bandar 18,
Pusat Bandar Puchong,
47160 Puchong, Selangor, Malaysia
Tel: 03-8080 7172
WhatsApp: +6016-660 7346
Email: mtmpre@yahoo.com
Website: www.mtmpre.com.my
We support industrial customers throughout Selangor, Kuala Lumpur, Johor, Penang, Melaka, Negeri Sembilan, Perak, Pahang, Kelantan, Terengganu, Kedah, Perlis, Sabah and Sarawak.
If your coating readings are too high, too low or inconsistent, send us a photo of the component, substrate information and several GT-1201 readings through WhatsApp +6016-660 7346.
We can help you determine whether the next step should be measurement troubleshooting, instrument checking or investigation of the coating process.
04 Oct 2026
