When to Stop Repairing an Existing Powder Coating Line
If you manage a powder finishing line, you’ll eventually have to consider replacing your aging powder coating equipment.
You’ll be faced with choosing between spending a significant amount of money or continuing with repairs and workarounds to keep the equipment functioning. From a business perspective, there’s one main question:
Is the powder coating line still a cost-effective production asset?
Sometimes, the answer isn’t clear-cut. Let’s look at key indicators that it may be time to stop repairing and move towards replacement.
Also, check out our Repair or Replace Checklist to evaluate your specific situation.
Equipment Reliability Is No Longer Predictable
It’s easy to measure if the time between breakdowns is getting shorter, or if the total amount of unplanned downtime is increasing.
A powder coating line should not experience frequent unscheduled stoppages due to finish quality issues or problems with the pretreatment equipment, booths, guns, ovens, conveyor, or controls.
If production is being interrupted and maintenance is becoming reactive and corrective rather than scheduled and preventative, the finishing department is in “failure management” mode.
Maintenance Costs Match Or Exceed A Practical Replacement Threshold
The best decision-making tool is a comparison of the coating system’s replacement cost with annual repair and unscheduled maintenance spending.
A common benchmark used in industrial equipment evaluation is:
If annual repair and unscheduled maintenance expenses total at least 8%–12% of system replacement cost, replacement should be seriously considered.
When calculating current maintenance and repair expenses, you need to not only include unplanned parts purchases, but also expenses like contracted repair services, in-house labor costs due to repairs, and downtime-related overtime needed to maintain your production schedule. You should also figure in revenue you lost due to downtime/reduced capacity.
Repeated replacement of the same components (burners, fans, pumps, safety devices, etc.) is another strong indicator that the system may be beyond the point of conventional maintenance.
Spare Parts & Controls Are Becoming Obsolete
A decision point is reached when OEM components aren’t readily available. Maintenance personnel encounter this when they can no longer easily source replacements for parts like temperature controllers, PLCS, HMIs, and burner management components, or when proprietary controls software is no longer supported.
This can happen when the equipment manufacturer goes out of business, terminates a product line, or discontinues support.
Once a control system or major component becomes obsolete, failures can force costly emergency retrofits or become unplanned engineering projects, which increase downtime.
Declining Oven Efficiency Has Become Costly
Older ovens can develop inefficiencies due to insulation breakdown, degraded door seals, structural sagging/panel warping, or compromised airflow. They can also suffer inefficiencies due to components that are outdated or not functioning properly.
Failing oven components can cause rising gas consumption, longer heat-up times, ignition failures, and more frequent safety alarms.
If the oven begins to require a higher setpoint temperature or longer dwell time to achieve the same part temperature that could previously be reached using a lower setpoint or shorter dwell time, the oven is losing thermal performance. It may no longer be capable of heating efficiently or retaining heat energy effectively.
A modern oven with properly engineered airflow, adequate recirculation, an effective insulation package, and accurate burner control can reduce fuel consumption while improving throughput and cure consistency.
Booth Performance Or Overspray Capture Is Faltering
Older booths may still function, but they can fail to maintain proper airflow and powder containment.
Common symptoms of aging booths include reduced or unstable airflow, noteworthy powder accumulation in booth corners, filter housings, or fan enclosures, declining reclaim efficiency, and excessive powder escape into the shop environment.
These issues create direct cost impacts through increased powder usage, higher filter consumption rates, and expanded housekeeping labor. As with other appliances, some booth repairs may require little more than replacing basic parts (or filters) and doing some in-depth cleaning, but it’s important to acknowledge how all these minor repairs and maintenance tasks contribute to the coating line’s overall “repair or replace” landscape.
With booths, there’s also an increased risk of combustible airborne dust hazards. Authorities can initiate unexpected shut-downs to address safety issues related to booth performance.
Pretreatment Is No Longer Fully Effective
If the pretreatment system doesn’t work well, the entire finishing process is compromised, regardless of booth and oven performance.
Changing your pretreatment chemistries can make your existing system unable to generate acceptable results. If the system isn’t properly designed for the chemistries currently being used—whether your pretreatment routine is manual (spray wand) or automated (multi-stage washer)—you’re inviting warranty nightmares once the finished products are in use.
If your chemicals, line speed, or pretreatment standards change, you can also end up with an insufficient number of stages or inadequate stage length to achieve proper cleaning/rinsing/sealing at the required line speed.
Other common problems include poor spray coverage due to clogged or damaged nozzles, inadequate pump output, damaged headers or risers, poor agitation, inadequate tank heating or inconsistent temperature control, and vapor migration into the shop environment due to exhaust issues.
When pretreatment issues lead to recurring adhesion failures, corrosion failures, or rework due to cosmetic issues, replacement is often more economical than attempting to modify a system that cannot operate properly with current chemistries or meet current performance requirements.
Conveyor Performance Becomes Inconsistent
If you’re using rolling racks or a manual conveyor, throughput issues may point to manpower problems. However, if your system uses a powered conveyor, aging conveyor components can cause throughput issues and related headaches.
Frequent chain replacement, binding, drive failures, or other wear-related issues can indicate your conveyor is becoming unreliable. Changes to product sizes or hanging schemes can also lead to overloading. Because constant process coating lines rely on accurate control of the pace at which parts move through the various appliances, hiccups with the conveyor can cause issues throughout the line that potentially generate extensive rework.
Most conveyorized lines are integrated with appliances that have been built to specific dimensions and performance characteristics. Some conveyors are even attached to the appliance structures. Because these engineered systems are typically delivered as turn-key solutions, replacing or upgrading the conveyor may necessitate replacing other appliances or the entire line.
Effective Process Control & Repeatability Are No Longer Achievable
A finishing department that relies on older equipment because it can still “coat parts” may no longer be able to consistently achieve professional quality finishes.
Outdated controls, poor maintenance practices, and aging components can create finishing equipment control issues that impact repeatability. If operators must compensate manually by slowing line speed, extending dwell time, increasing powder output, adjusting oven setpoints, or increasing inspection and touch-up labor, the system is no longer adequately process-controlled. Instead, it is being operated using tribal knowledge, which can be wildly inefficient and makes the business vulnerable to personnel issues.
Safety and Code Compliance Risks Are Increasing
Older powder coating lines may not meet current requirements for NFPA compliance, combustion safety, workspace environmental concerns, or combustible dust control.
Liabilities include poor safety interlock design or maintenance (burner running without airflow verification or booth capable of operating without meeting basic airflow requirement), inadequate explosion venting, and increased powder buildup or migration outside of the booth.
It’s also common for maintenance personnel to jump out tripped safeties on older equipment in order to temporarily regain equipment functionality rather than resolve the root problem. This can lead to disastrous consequences. A serious safety event (flash fire, dust ignition, or burner malfunction) can easily cost more than the capital expense of equipment replacement.
If the system is generating concerns from audits, insurance inspections, or internal plant safety personnel, repairs may not be sufficient. In many cases, full compliance requires major system redesign, not component replacement.
The ROI-Based Conclusion
A powder coating line should be evaluated like any other production asset: by considering throughput capacity, uptime, operating cost, safety risk, and ability to meet quality requirements.
If your equipment is causing recurring downtime, inconsistent coating quality, or increased compliance concerns, it’s a capital planning problem. The best-performing coaters replace equipment proactively, before failure forces a rushed purchase or leads to extended downtime.
When planned correctly, a new batch or conveyorized powder coating system typically delivers ROI through:
- Higher Overall Equipment Effectiveness (OEE)
- Reduced labor and rework
- Improved coating consistency
- Lower powder waste and reduced filter costs
- Reduced gas and electrical consumption
- Improved compliance and reduced safety exposure
If you have questions about your existing line, want to schedule a free on-site evaluation, or just need a rough estimate for CapEx budgeting, give Reliant Finishing Systems a call at (256) 355-9000 and talk with our team of experts.