collision repair - solvent and paint-contaminated waste 11-1 (a) wastes associated with automotive...

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

Wastes Associated with Wastes Associated with Automotive PaintingAutomotive Painting

Waste paint (old, leftover, dried etc.)Waste paint (old, leftover, dried etc.) Solvent (various types)Solvent (various types) All materials contaminated with paint All materials contaminated with paint

including:including:– Used paint booth arrestors (also called exhaust Used paint booth arrestors (also called exhaust

filters)filters)– Disposable ragsDisposable rags

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

Wastes Associated with Wastes Associated with Automotive PaintingAutomotive Painting

– Masking tape and paperMasking tape and paper– Floor sweepingsFloor sweepings– Disposable mixing cups and sticksDisposable mixing cups and sticks– Disposable paint strainersDisposable paint strainers


Minimize the Amount of Minimize the Amount of Painting WastePainting Waste

Use reusable mixing cups and sticksUse reusable mixing cups and sticks– Clean them in a mechanical gun wash system.Clean them in a mechanical gun wash system.

Use cloth rags that are cleaned by a laundry Use cloth rags that are cleaned by a laundry service and returned.service and returned.

Improve transfer efficiency of coating Improve transfer efficiency of coating operations.operations.

Recycle solvent on-site with a solvent Recycle solvent on-site with a solvent distillation unit.distillation unit.


Minimize the Amount of Painting Minimize the Amount of Painting WasteWaste

Recycle solvent off-site - recycling service.Recycle solvent off-site - recycling service. Prevent solvent evaporation - close lids.Prevent solvent evaporation - close lids. Use a mechanical gun wash system to reduce Use a mechanical gun wash system to reduce

solvent waste.solvent waste. Keep records of the types and quantities of Keep records of the types and quantities of

materials used to better estimate future jobs. materials used to better estimate future jobs. Use a material usage tracking form.Use a material usage tracking form.

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

Minimize the Hazardous Nature Minimize the Hazardous Nature of Paint-Related Wasteof Paint-Related Waste

Use undercoats and topcoats that contain no Use undercoats and topcoats that contain no heavy metals.heavy metals.– Arsenic, barium, cadmium, chromium, lead, Arsenic, barium, cadmium, chromium, lead,

mercury, selenium, and silver.mercury, selenium, and silver. Use low-VOC paint and solvent products.Use low-VOC paint and solvent products. Use water-based coatings when practical.Use water-based coatings when practical.


Disposal of Paint-Related WastesDisposal of Paint-Related Wastes

Liquid paint and solvent wasteLiquid paint and solvent waste– Managed as a hazardous waste.Managed as a hazardous waste.– Stored in sealed containers labeled “Hazardous Stored in sealed containers labeled “Hazardous

Waste ”.Waste ”.– Disposal by a hazardous waste management Disposal by a hazardous waste management

company.company.


Disposal of Paint-Related WastesDisposal of Paint-Related Wastes

Dry paint-related wastes: paint booth Dry paint-related wastes: paint booth arrestors, rags, floor sweepings, masking tape arrestors, rags, floor sweepings, masking tape etc... etc... – Potentially hazardous due to metals, solvents and Potentially hazardous due to metals, solvents and

must be laboratory tested.must be laboratory tested.– If hazardous, must be managed same as liquid If hazardous, must be managed same as liquid

paint and solvent wastespaint and solvent wastes– If nonhazardous may landfill with approval and If nonhazardous may landfill with approval and

permits.permits.


Transfer EfficiencyTransfer Efficiency

Transfer Efficiency (TE) is the ratio of the Transfer Efficiency (TE) is the ratio of the mass of solids (in the paint) reaching the mass of solids (in the paint) reaching the surface being coated, to the mass of solids surface being coated, to the mass of solids sprayed.sprayed.

Transfer Efficiency = (Mass of Coating Transfer Efficiency = (Mass of Coating [Solids] Sprayed - Mass of Coating [Solids] Sprayed - Mass of Coating [Solids] Applied).[Solids] Applied).


Transfer EfficiencyTransfer Efficiency

High transfer efficiency means less paint is High transfer efficiency means less paint is wasted in overspray.wasted in overspray.

Poor transfer efficiency causes excessive Poor transfer efficiency causes excessive paint and solvent waste.paint and solvent waste.


Factors Affecting Transfer Factors Affecting Transfer EfficiencyEfficiency

Factors that cannot be controlled by the Factors that cannot be controlled by the spray operator.spray operator.– Size and shape of the parts sprayed.Size and shape of the parts sprayed.– Atmospheric conditionsAtmospheric conditions– Finish quality requirements.Finish quality requirements.


Factors Affecting Transfer Factors Affecting Transfer EfficiencyEfficiency

Factors that can be controlled by the spray Factors that can be controlled by the spray operator:operator:– Spray equipment typeSpray equipment type– Gun set upGun set up– Spray angleSpray angle– Spray distanceSpray distance– Spray techniquesSpray techniques– Spray equipment maintenance and practicesSpray equipment maintenance and practices


Improving Spray TechniqueImproving Spray Technique

Operator spray technique is the most important Operator spray technique is the most important element in achieving a good transfer element in achieving a good transfer efficiency.efficiency.

Spray AngleSpray Angle– Gun perpendicular to the surface being sprayedGun perpendicular to the surface being sprayed– Use parallel strokes.Use parallel strokes.– Never arc the gun Never arc the gun

» except when performing blending operations or panel except when performing blending operations or panel spotting.spotting.



Spray Pattern.Spray Pattern.– Uniform pattern Uniform pattern – Coating must be atomized properly.Coating must be atomized properly.

Spray DistanceSpray Distance– Appropriate distance from the surface being Appropriate distance from the surface being

sprayed.sprayed.» 6 to 8 inches (as close as 4 in. with some gun/coating 6 to 8 inches (as close as 4 in. with some gun/coating

combinations)combinations)

» Distance constant throughout the coating operation.Distance constant throughout the coating operation.

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


Spray OverlapSpray Overlap– 50 per cent overlap for each pass50 per cent overlap for each pass– Feathering the trigger at the beginning and end Feathering the trigger at the beginning and end

of each pass.of each pass.» Note: Technique may be altered slightly when Note: Technique may be altered slightly when

applying high metallic, high solids base coats and applying high metallic, high solids base coats and some three stage systemssome three stage systems

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


General Spray TechniquesGeneral Spray Techniques– Have a “plan of attack”Have a “plan of attack”– Do a “dry run” to practice spraying strategy.Do a “dry run” to practice spraying strategy.– For small and medium sized panels - make For small and medium sized panels - make

each pass the full length of the panel.each pass the full length of the panel.– Spray larger panels in the same way, walking Spray larger panels in the same way, walking

the length of the panel.the length of the panel.

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


– Keep blended areas as small as possible. Keep blended areas as small as possible. – Spray the border edges of the substrate first Spray the border edges of the substrate first

(banding). (banding). High Transfer Efficiency Spray Equipment High Transfer Efficiency Spray Equipment

– HVLP gun uses high-volume/low pressure HVLP gun uses high-volume/low pressure – LPLV gun uses low pressure/low volume LPLV gun uses low pressure/low volume

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


Choose the Best Equipment You Can Choose the Best Equipment You Can Afford !Afford !– Equipment budget.Equipment budget.– Coating types being sprayed.Coating types being sprayed.– Ask paint representative for assistance.Ask paint representative for assistance.– Choose spray equipment for highest transfer Choose spray equipment for highest transfer

efficiency and proper atomization.efficiency and proper atomization.

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


– Use the proper fluid tip/air cap combination and Use the proper fluid tip/air cap combination and gun settings for the material being sprayed. gun settings for the material being sprayed.

– Remember >>> A paint gun is only as good as Remember >>> A paint gun is only as good as the operator using it !!!!!the operator using it !!!!!

Gun Set-upGun Set-up– Correct size of fluid tip-air cap combination.Correct size of fluid tip-air cap combination.

» Fluid tip size is determined by coating viscosityFluid tip size is determined by coating viscosity

» Viscosity is measured by a Zahn cup measuring Viscosity is measured by a Zahn cup measuring system.system.

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


– Choice of air cap depends of the fluid tip sizeChoice of air cap depends of the fluid tip size» Ask spray gun manufacturers for recommendationsAsk spray gun manufacturers for recommendations

– Set the air pressure at the lowest possible Set the air pressure at the lowest possible setting. setting.

» Never exceed the coating manufacturer's Never exceed the coating manufacturer's recommended air pressure settings.recommended air pressure settings.

– Keep records of gun set ups used with each Keep records of gun set ups used with each type of coating to reduce set up time and type of coating to reduce set up time and material wasted during set up.material wasted during set up.

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


Spray Equipment Maintenance Spray Equipment Maintenance – Maintaining clean equipment clean in good Maintaining clean equipment clean in good

working order ensures proper atomization and a working order ensures proper atomization and a full, consistent spray pattern.full, consistent spray pattern.

collision repair - solvent and paint-contaminated waste 11-1 (a) wastes associated with automotive...

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