Troubleshooting Guide

 

 
 

 Applications

 
 
 
 
Problem
 
 
 
Reason
 
 
 
Solution
 

 
 
 
Heavy Orange Peel
 
Too thick.
 
Adjust film build.
 
 
 
 
Too long on ramp up to peak temperature.
Adjust air flow in oven.
 
 
KV too high.
Reduce voltage.
 
 
Inappropriate powder.
Contact PTI.
 

 
 
 
 
Low Gloss
 
Contamination with an incompatible powder.
 
Clean equipment before changing powders.
 
 
 
Gassing - micropinholing.
Check for damp substrate (especially if porous) or moist powder bed from compressed air.
 
 
Increased film build.
 
 
Over-curing.
Check oven - Where parts in oven with line stopped for an excessive amount of time?
 

 
 
 
 
High Gloss
 
Under-cure.
 
Increase oven temperature or time in oven.
 
 
 
Inappropriate powder.
Contact PTI.
 

 
 
 
 
Contamination
 
Malfunction in application process.
 
Check reclaim system, hooks and conveyor line, compressed air, and pre-treatment / dry-off system for source of problem
 
 
 
Problem with virgin powder
Contact PTI.
 

 
 
 
 
Off Color
 
Fouling from improper exhaust in oven
 
Clean vents and check exhaust fans
 
 
 
Over-bake
Adjust line speed, oven temperature
 
 
Where parts in oven with line stopped for an excessive amount of time?
 

 
 
 
 
Blistering or Pull-Away from Edges
 
Moisture
 
Check parts after the dry-off oven for dampness and improper drainage
 
 

 
 
 
 
Poor Film Build on Recessed Areas
 
Faraday cage effects
 
Check for poor ground.
 
 
Reduce gun KV setting.
 
 
 
Contact PTI.
 
 
 Physical Properties
Problem
 
 
 
Reason
 
 
 
Solution
 
 

 
 
 
 
Poor Impact or Flexibility
 
Under cure
 
Adjust oven temperature/dwell time
 
 
Poorly prepared substrate
Check substrate for incomplete mechanical cleaning (abrasion) or for problems with pretreatment system
 
 
Coating too thick
Adjust film build
 
 
Variation in substrate composition or gauge
Contact substrate supplier
 
 
Inappropriate powder
Contact PTI
 
 

 
 
 
 
Poor Adhesion
 
Undercure
 
Adjust oven temperature/dwell time
 
 
Poorly prepared substrate
Check substrate for incomplete mechanical cleaning (abrasion) or for problems with pretreatment system
 
 
Variation in substrate composition or gauge
Contact substrate supplier
 
 
Inappropriate powder
Contact PTI
 
 

 
 
 
 
Poor Corrosion Resistance
 
Coating too thin
 
Adjust film build
 
 
Poorly prepared substrate
Check substrate for incomplete mechanical cleaning (abrasion) or for problems with pretreatment system
 
 
Variation in substrate composition or gauge
Contact substrate supplier
 
 
Inappropriate powder
Contact PTI
 
 

 
 
 
 
Poor Chemical Resistance
 
Undercure
 
Adjust oven temperature/dwell time
 
 
Inappropriate powder
Contact PTI
 
 

 
 
 
 
Poor Abrasion Resistance or Hardness
 
Under-cure
 
Adjust oven temperature/dwell time
 
 
Inappropriate powder
Contact PTI