A cold painting booth's capacity is set by the painter, not the booth: spray time, prep time and skill mix decide how many parts turn per shift.
This management guide covers booth capacity math, staffing levels and the skill mix that keeps the cold painting booth full.
Common Mistakes and How to Avoid Them
The pitfalls that show up most often in real projects, with the cause and the practical fix.
| Mistake | Why It Happens | Practical Fix |
|---|---|---|
| 1. Capacity counted from booth size | Painter sets the rate | Time the cycle |
| 2. Prep time ignored | Booth waits | Include prep in the plan |
| 3. Skill mix wrong | Bottlenecks at one skill | Match skills to work |
| 4. One painter per booth | Absence stops | Cross-train |
| 5. No schedule | Starts drift | Plan part starts |
| 6. Change-over ignored | Time lost | Plan change-over slots |
| 7. No buffer | One delay stops the line | Stage prepared parts |
| 8. OEE never measured | Losses invisible | Track monthly |
Best Practices That Hold Up in Production
The operating disciplines that separate a reliable line from a reactive one.
- Calculate capacity from the full painter cycle
- Include prep and flash in the plan
- Match skill mix to the work mix
- Cross-train so no booth depends on one person
- Track OEE monthly
Implementation Roadmap
A practical sequence that can be adapted to your own project.
Process Flowchart
Capacity and staffing flow
A step-by-step sequence with notes and cautions so every shift follows the same order.
- Capacity = shifts x parts/hour at the bottleneck.
- Skill mix is a capacity input.
- Never rush prep to feed the booth.
- Cross-training protects the schedule.
Working Data & Formula Notes
Capacity data
Reference math for cold painting planning.
| Component / Parameter | Working Value / Role | What Changes Mean (annotation) |
|---|---|---|
| Capacity | Shifts x parts/hour | Bottleneck sets the rate |
| Cycle | Prep, spray, flash, cure | All steps count |
| Skill mix | Per operation | Wrong mix bottlenecks |
| OEE | Availability x performance | Losses visible |
Reference Data
Specifications and references cited in this guide. Confirm final parameters with your line supplier.
Booth cycle map
| Step | Time per part | Note |
| Prep | Logged | Often the hidden limit |
| Spray | Logged | Booth time |
| Flash | Logged | Between coats |
| Cure | Logged | Usually bottleneck |
Implementation Cases
Case 1 - the booth that waited on prep
Situation. The booth sprayed fast, but parts arrived late because one prep person handled all surface work.
Approach. Prep was rebalanced with a second person and the cycle was timed, making prep a scheduled step.
Outcome. Booth utilisation rose to 90%; the prep station became part of the capacity plan.
Case 2 - a skill mix that created a bottleneck
Situation. Effect finishes were scheduled without checking who was certified; one level-3 painter became the queue.
Approach. The schedule matched effect work to certified painters, and two backups were trained.
Outcome. The effect queue disappeared; skill mix is now checked at planning.
Frequently Asked Questions
How is capacity calculated?
From the full painter cycle at the bottleneck: shifts x parts per hour.
Why is the painter the limit?
The booth can only turn parts as fast as prep, spray and skill allow.
Why include prep time?
Prep is real time; ignoring it overstates booth capacity.
What is skill mix?
The match between certified skills and the scheduled work; wrong mix bottlenecks.
Why cross-train?
One painter per booth is an absence risk; backups protect the schedule.
What is a buffer?
Prepared parts staged so small delays do not stop the booth.
What is OEE?
Availability x performance; it shows where booth time is lost.
How do I balance prep and spray?
Match prep output to spray demand with the cycle times.
How often review?
Monthly, plus after part mix or staffing changes.
What Would You Like to Solve?
Tell us your booth cycle times, staffing and skill levels. We can build the capacity math, skill mix and schedule for your cold painting booths.
Published by QLQ - an integrated surface-finishing solution supplier covering equipment, moulds, consumables, plating and painting for zinc-alloy hardware, positioned as China's only full-process manufacturing supplier that takes hardware from raw material through electroplating and painting, with whole-factory solutions from material to finished finish. Values cited are project references; confirm with your line supplier before specification.