Paint Booth Filters Now AvailableGet Your Quote
filters Issue

Contamination Problems

Contamination is the enemy of quality finishes. Here's how to find it and eliminate it.

Emergency: (877) 489-3727Start Diagnosis

What You're Experiencing

Paint finishes are being contaminated by foreign materials entering the coating, causing defects and rejections.

Visual Signs:

  • Dust nibs in finish
  • Fisheye craters (silicone)
  • Oil spots or beading
  • Fiber inclusions
  • Water spots or blushing
  • Random defects across parts

Sound Signs:

  • Spray gun sputtering (contaminated material)

Safety Risks — Read Before Proceeding

medium(OSHA HazCom)

Chemical exposure from cleaning

Action: Use appropriate PPE when cleaning or using solvents to remove contamination.

Immediate Steps to Take

  1. 1

    Identify contamination type (dust, silicone, oil, water)

  2. 2

    Check intake filter condition and type

  3. 3

    Test compressed air quality (water, oil)

  4. 4

    Review part cleaning process

  5. 5

    Inspect booth for dust sources

  6. 6

    Check operator PPE and hygiene

  7. 7

    Identify any changes correlating with problem

Common Causes

Here are the most likely reasons you're experiencing this problem, ranked by how often we see them.

Dirty Intake Air

common

Intake filters dirty or wrong type, allowing dust into booth.

Compressed Air Contamination

common

Water, oil, or particles in compressed air supply.

Part Contamination

common

Parts not properly cleaned before entering booth.

Operator Contamination

occasional

Clothing, skin products, or handling introducing contaminants.

Booth Cleanliness

occasional

Accumulated overspray, debris, or contamination in booth.

External Sources

occasional

Nearby operations (welding, grinding, cleaning) introducing contaminants.

Interactive Diagnostic Tool

Contamination Source Diagnostic

Step 1 of 5

Are defects fisheye craters (silicone contamination)?

If unsafe at any point: For severe contamination outbreak, call WERCS at (877) 489-3727 for rapid investigation.

When to Call WERCS

While some issues can be resolved with basic troubleshooting, these situations require professional service:

  • Cannot identify contamination source
  • Contamination affecting production
  • Air quality testing needed
  • Booth environment assessment
  • Process improvement support
  • Filter system evaluation

Priority Service Available

(877) 489-3727

Expert technicians nationwide

Contamination Problems FAQ

Common questions about this issue

Systematic elimination: 1) Test compressed air with white cloth, 2) Check intake filters, 3) Spray test panel with new material, 4) Inspect part prep area, 5) Review operator practices. Change one variable at a time.
Silicone is persistent. Steps: identify source (often shop products, personal care, tire dressings), ban silicone products from area, clean all surfaces, change intake filters, clean air lines. May take weeks to fully clear.
Walls/ceiling: weekly minimum, more if high production. Floors: daily or after each shift. Full strip/clean: monthly or per contamination incidents. Document cleaning for quality records.
MERV 8-13 for general dust. Higher efficiency (HEPA-like) for sensitive applications. Tacky pre-filters for high dust. Match filter to your environment and finish requirements. Change per schedule or differential pressure.

Have a question not answered here?

Call us at (877) 489-3727

Related Problems

Dust ContaminationFisheye DefectsWater In Air LinesFilter CloggedCoating Defects

Can't Fix It? We Can.

WERCS expert technicians service paint booths and extraction systems nationwide. 24/7 emergency service available.

Call (877) 489-3727Request Service Quote