Ensuring a Defect-Free Finish
Mistakes in the manufacturing and application process can cause a paint job to display unwelcome defects.
At Spectrum Metal, we work hard to make sure that flaws often seen as the result of a less careful approach will never affect your paint job.
|PROBLEM||WHAT IT LOOKS LIKE||WHY IT HAPPENS||WHY IT WON’T HAPPEN WITH SPECTRUM PAINTS|
Blister-like swollen areas
Cratering when blisters burst
Finish will have pinpoint holes
Solvent is trapped due to film build
Baking begun too quickly, without sufficient flash-off time
SOP’s and automated equipment allows for controlled application
Flash-off time closely monitored
Temperature is increased gradually via multi-zone oven controls
|Adhesion failure||Paint peels or flakes|
Surface is contaminated with grease, oil, etc.
Surface has not been properly prepared.Paint has not been properly cured.
Pre-treatment processes to ensure optimum chemical composition.
Monthly sampling to test for proper coating weight.Close control of ovens to assure proper curing.
|Light coverage||Substrate surface shows through paint.||Inadequate film build.Electronic fields (Faraday cage effect) may interfere with adhesion.|
Discuss project parameters with customer to ensure all areas of part are covered.
Basecoat applied to difficult-to-reach areas using automated equipment.Recessed areas are hand-sprayed.
|Inconsistent color||Color varies from job-to-job or part-to-part|
Variations in paint quality from batch to batch.
Inadequate agitation during production.
Burnt material, over baking.
Full inspection of all paints, whether from outside sources or blended in-house.
Consistency assured by proper agitation.Ovens under tight control to prevent burning or over baking.
|Rack marks||Some areas on part get less than full coverage, or no paint at all|
Racks directly contacting or in close proximity to part result in light coverage areas, or no paint.
Blotchy sections on part caused by excessive paint build-up on rack softening in the oven; the part then sinks into the rack.
Minimal contact between part and rack due to carefully designed racks.
Racks kept clean, with minimal build-up, due to aggressive maintenance schedule.
|Wet mill marks||1½-inch indentations on an exposed surface||Wet mil measurements taken to determine the thickness of a coating.|
Automated, controlled application results in consistent paint film thickness, so wet mil testing can be done less frequently.
Hand-spray sweep after measurements minimizes wet mil marks.