A coatings batch reaches its test point, but the viscosity result is outside the approved target. The record may then say only “adjusted” or “passed after retest,” without showing what changed, who approved it, or how quantity and cost changed.
A useful coatings batch correction record treats the response as a controlled event. It connects the approved formula, first test, hold, authorized adjustment, retest, and final disposition. It does not provide chemistry instructions or invite improvisation. The adjustment must follow the manufacturer’s approved procedure.
A correction should preserve the original story
Do not overwrite the planned quantity or replace the first test with the passing result. Show what was intended, observed, done, and found next.
That sequence matters because several later questions depend on it:
- Was the correct formula version used?
- Was the batch kept from moving forward while its status was unresolved?
- Was the adjustment authorized and made with an approved material?
- Can the material lot and quantity be traced?
- Does the final output reconcile with additions and documented losses?
- Is this a one-time correction or evidence that the formula or process needs review?
For the broader chain around these questions, see the record flow from formula and pigment lot through the finished coatings batch.
Start with the approved formula baseline
Point to the formula identifier and revision released for production. Capture planned batch size, process step, target viscosity range, and the approved test or work instruction.
This prevents ambiguity. Do not diagnose the cause prematurely; make the applicable baseline visible.
Record the initial observation as it happened
Keep the original coating quality check intact. At minimum, record:
- sample or test identifier;
- date and time;
- process stage and, when relevant, sample location;
- measured result and target range;
- test method or equipment reference;
- operator or tester; and
- any required test conditions defined by the company’s procedure.
Write neutrally. “Result above target range” is more useful than “bad batch,” which mixes a measurement with an unauthorized disposition.
Put the batch on a visible hold
An out-of-target result should trigger the status required by procedure. Show when the batch entered hold or another controlled status, who applied it, and what was restricted pending review.
This separates “we noticed a problem” from “we controlled what happened next.” If workplace materials are hazardous, adjustment work remains subject to the company’s hazard communication program, labels, safety data sheets, and training. OSHA’s Hazard Communication Standard describes those elements; it does not prescribe an adjustment.
Capture the authorized adjustment as a separate event
The viscosity adjustment entry should identify exactly what production did without turning the batch record into informal chemistry advice. Use the generic identity of the company-approved adjustment material or its internal material code, then record:
- authorization or approved procedure reference;
- adjustment material lot number;
- actual quantity added and unit of measure;
- operator;
- date and time;
- reason for the adjustment;
- equipment or process step, if required; and
- reviewer or approver, according to internal responsibility rules.
If there are multiple additions, record each one separately. Do not collapse three additions into one total entered at the end of the shift. Event-level entries preserve sequence and make it possible to reconcile inventory and understand how the result changed after each action.
Retest with a new sample and result
After the adjustment and required processing, create a new test entry. Link it to the event without overwriting the first result. Record sample ID, time, method, conditions, result, tester, and target.
The retest does not automatically release the batch. Acceptance, further review, rework, downgrade, or rejection belongs in the defined disposition process. NIST MEP supports structured problem diagnosis and improvement; correction history provides evidence instead of undocumented fixes.
Reconcile yield and cost after the addition
Every approved addition changes the material balance and usually the batch cost. The batch yield reconciliation should therefore compare the revised theoretical quantity with accounted output and documented losses.
Worked example
A batch was planned at 200 kg. An authorized event added 3 kg of an approved adjustment material.
- Planned batch: 200 kg
- Approved adjustment: +3 kg
- Revised theoretical total: 203 kg
- Documented process or transfer loss: −0.8 kg
- Accounted output: 202.2 kg
The arithmetic is `200 + 3 = 203 kg`, then `203 − 0.8 = 202.2 kg`. Carry the 3 kg material issue into actual cost and classify the 0.8 kg under the company’s loss or variance practice. Do not leave the quantity at 200 kg.
If one batch uses more than one incoming lot, the same discipline applies. The split pigment lot reconciliation example shows why each lot contribution needs its own quantity trail.
Close with a clear final disposition
The final entry should state the disposition, who authorized it, and when. Depending on approved internal procedures, that might be release, further evaluation, another controlled adjustment, rework, downgrade, or rejection. Avoid vague endings such as “handled” or “looks good.”
The correction record should also link any resulting inventory movement, finished quantity, cost update, deviation review, or investigation. That creates a complete paint batch record rather than an isolated quality note.
Does the formula need a revision?
Not every correction justifies changing the master formula. Keep batch history and formula governance separate.
A one-time formula deviation may remain batch-specific. Repeated corrections or an approved permanent change may justify separate formula review. Issue a new controlled revision only through authorization; never rewrite the version an earlier batch used.
For related scale questions, review how a custom paint sample moves into a controlled production-scale formula.
A practical correction-record checklist
Before closing a corrected batch, confirm that the record shows:
- the released formula and target baseline;
- the original sample, observation, and test result;
- the hold or controlled status;
- the authorization for the response;
- each adjustment material, lot, quantity, operator, time, and reason;
- the post-adjustment sample and result;
- revised theoretical quantity, actual output, loss, and cost effect;
- final disposition and approver; and
- a separate formula-review decision when the pattern warrants one.
Kerno can connect formulas, materials, lots, batches, costs, and quality records without reducing a correction to a vague note. The useful outcome is a history of what was planned, changed, and reconciled. See the Kerno overview for paints and coatings formulas, batches, costs, and quality.
Compare one recently corrected batch with the checklist. Any blank—especially authorization, lot, retest, or revised yield—is a concrete improvement target.
Frequently Asked Questions
Is a viscosity adjustment automatically a formula revision?
No. The adjustment belongs in the executed batch record. A permanent formula change should follow a separate review and approval process, based on the manufacturer’s criteria and evidence.
Who should authorize a batch adjustment?
The person or role named in the manufacturer’s approved procedure. The record should identify that authorization rather than assume the operator had standing permission.
What if more than one adjustment is needed?
Record each addition as its own event with material, lot, quantity, operator, time, reason, and linked retest. Do not enter only a combined total after the work is complete.
What should happen if the adjusted batch still misses its target?
Keep the batch in the status required by the company’s procedure and route it for authorized disposition. Do not treat an attempted adjustment as evidence that the batch passed.
