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Wastes Associated with Automotive Painting. Waste paint (old, leftover, dried etc.) Solvent (various types) All materials contaminated with paint including: Used paint booth arrestors (also called exhaust filters) Disposable rags. Wastes Associated with Automotive Painting.

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wastes associated with automotive painting
Wastes Associated with Automotive Painting
  • Waste paint (old, leftover, dried etc.)
  • Solvent (various types)
  • All materials contaminated with paint including:
    • Used paint booth arrestors (also called exhaust filters)
    • Disposable rags

Collision Repair - Solvent and Paint-contaminated Waste 11-1 (a)

wastes associated with automotive painting2
Wastes Associated with Automotive Painting
  • Masking tape and paper
  • Floor sweepings
  • Disposable mixing cups and sticks
  • Disposable paint strainers

Collision Repair - Solvent and Paint-contaminated Waste 11-1 (b)

minimize the amount of painting waste
Minimize the Amount of Painting Waste
  • Use reusable mixing cups and sticks
    • Clean them in a mechanical gun wash system.
  • Use cloth rags that are cleaned by a laundry service and returned.
  • Improve transfer efficiency of coating operations.
  • Recycle solvent on-site with a solvent distillation unit.

Collision Repair - Solvent and Paint-contaminated Waste 11-2 (a)

minimize the amount of painting waste4
Minimize the Amount of Painting Waste
  • Recycle solvent off-site - recycling service.
  • Prevent solvent evaporation - close lids.
  • Use a mechanical gun wash system to reduce solvent waste.
  • Keep records of the types and quantities of materials used to better estimate future jobs.
  • Use a material usage tracking form.

Collision Repair - Solvent and Paint-contaminated Waste 11-1 (b)

minimize the hazardous nature of paint related waste
Minimize the Hazardous Nature of Paint-Related Waste
  • Use undercoats and topcoats that contain no heavy metals.
    • Arsenic, barium, cadmium, chromium, lead, mercury, selenium, and silver.
  • Use low-VOC paint and solvent products.
  • Use water-based coatings when practical.

Collision Repair - Solvent and Paint-contaminated Waste 11-3

disposal of paint related wastes
Disposal of Paint-Related Wastes
  • Liquid paint and solvent waste
    • Managed as a hazardous waste.
    • Stored in sealed containers labeled “Hazardous Waste ”.
    • Disposal by a hazardous waste management company.

Collision Repair - Solvent and Paint-contaminated Waste 11-4 (a)

disposal of paint related wastes7
Disposal of Paint-Related Wastes
  • Dry paint-related wastes: paint booth arrestors, rags, floor sweepings, masking tape etc...
    • Potentially hazardous due to metals, solvents and must be laboratory tested.
    • If hazardous, must be managed same as liquid paint and solvent wastes
    • If nonhazardous may landfill with approval and permits.

Collision Repair - Solvent and Paint-contaminated Waste 11-4 (b)

transfer efficiency
Transfer Efficiency
  • Transfer Efficiency (TE) is the ratio of the mass of solids (in the paint) reaching the surface being coated, to the mass of solids sprayed.
  • Transfer Efficiency = (Mass of Coating [Solids] Sprayed - Mass of Coating [Solids] Applied).

Collision Repair - Solvent and Paint-contaminated Waste 11-5 (a)

transfer efficiency9
Transfer Efficiency
  • High transfer efficiency means less paint is wasted in overspray.
  • Poor transfer efficiency causes excessive paint and solvent waste.

Collision Repair - Solvent and Paint-contaminated Waste 11-5 (b)

factors affecting transfer efficiency
Factors Affecting Transfer Efficiency
  • Factors that cannot be controlled by the spray operator.
    • Size and shape of the parts sprayed.
    • Atmospheric conditions
    • Finish quality requirements.

Collision Repair - Solvent and Paint-contaminated Waste 11-6 (a)

factors affecting transfer efficiency11
Factors Affecting Transfer Efficiency
  • Factors that can be controlled by the spray operator:
    • Spray equipment type
    • Gun set up
    • Spray angle
    • Spray distance
    • Spray techniques
    • Spray equipment maintenance and practices

Collision Repair - Solvent and Paint-contaminated Waste 11-6 (b)

improving spray technique
Improving Spray Technique
  • Operator spray technique is the most important element in achieving a good transfer efficiency.
  • Spray Angle
    • Gun perpendicular to the surface being sprayed
    • Use parallel strokes.
    • Never arc the gun
      • except when performing blending operations or panel spotting.

Collision Repair - Solvent and Paint-contaminated Waste 11-7 (a)

improving spray technique13
Improving Spray Technique
  • Spray Pattern.
    • Uniform pattern
    • Coating must be atomized properly.
  • Spray Distance
    • Appropriate distance from the surface being sprayed.
      • 6 to 8 inches (as close as 4 in. with some gun/coating combinations)
      • Distance constant throughout the coating operation.

Collision Repair - Solvent and Paint-contaminated Waste 11-7 (b)

improving spray technique14
Improving Spray Technique
  • Spray Overlap
    • 50 per cent overlap for each pass
    • Feathering the trigger at the beginning and end of each pass.
      • Note: Technique may be altered slightly when applying high metallic, high solids base coats and some three stage systems

Collision Repair - Solvent and Paint-contaminated Waste 11-7 (c)

improving spray technique15
Improving Spray Technique
  • General Spray Techniques
    • Have a “plan of attack”
    • Do a “dry run” to practice spraying strategy.
    • For small and medium sized panels - make each pass the full length of the panel.
    • Spray larger panels in the same way, walking the length of the panel.

Collision Repair - Solvent and Paint-contaminated Waste 11-7 (d)

improving spray technique16
Improving Spray Technique
    • Keep blended areas as small as possible.
    • Spray the border edges of the substrate first (banding).
  • High Transfer Efficiency Spray Equipment
    • HVLP gun uses high-volume/low pressure
    • LPLV gun uses low pressure/low volume

Collision Repair - Solvent and Paint-contaminated Waste 11-7 (e)

improving spray technique17
Improving Spray Technique
  • Choose the Best Equipment You Can Afford !
    • Equipment budget.
    • Coating types being sprayed.
    • Ask paint representative for assistance.
    • Choose spray equipment for highest transfer efficiency and proper atomization.

Collision Repair - Solvent and Paint-contaminated Waste 11-7 (f)

improving spray technique18
Improving Spray Technique
    • Use the proper fluid tip/air cap combination and gun settings for the material being sprayed.
    • Remember >>> A paint gun is only as good as the operator using it !!!!!
  • Gun Set-up
    • Correct size of fluid tip-air cap combination.
      • Fluid tip size is determined by coating viscosity
      • Viscosity is measured by a Zahn cup measuring system.

Collision Repair - Solvent and Paint-contaminated Waste 11-7 (g)

improving spray technique19
Improving Spray Technique
  • Choice of air cap depends of the fluid tip size
    • Ask spray gun manufacturers for recommendations
  • Set the air pressure at the lowest possible setting.
    • Never exceed the coating manufacturer's recommended air pressure settings.
  • Keep records of gun set ups used with each type of coating to reduce set up time and material wasted during set up.

Collision Repair - Solvent and Paint-contaminated Waste 11-7 (h)

improving spray technique20
Improving Spray Technique
  • Spray Equipment Maintenance
    • Maintaining clean equipment clean in good working order ensures proper atomization and a full, consistent spray pattern.

Collision Repair - Solvent and Paint-contaminated Waste 11-7 (i)