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Module 4B2

Module 4B2. Select and Understand The Use of Repair Finishing Systems and System Parts. Methods of Refinishing - Touch-Up Refinishing. Used to repair minor scratches and chips Uses sanding, brush painting, and polishing Does not use a spray gun. Methods of Refinishing - Spot Refinishing.

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Module 4B2

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  1. Module 4B2 Select and Understand The Use of Repair Finishing Systems and System Parts

  2. Methods of Refinishing - Touch-Up Refinishing • Used to repair minor scratches and chips • Uses sanding, brush painting, and polishing • Does not use a spray gun

  3. Methods of Refinishing - Spot Refinishing • Small areas • Requires primer-surfacer or primer-sealer • Requires blending of topcoats

  4. Methods of Refinishing - Panel Refinishing • Same technique as spot repair • Includes entire panels (hoods, doors, etc) • May require blending

  5. Methods of Refinishing - Total Body Refinishing • Refinish entire vehicle • Reasons: • Number of spots repaired • Dull, cracked, worn finish • Direction of customer

  6. Surface Analysis - Determining a Good Surface • Good surface has minor problems: • Stone bruises, off-color, orange peel • Poor surface has major problems: • Defect affects the entire thickness or a large area • Deep scratches, rust, lifting, peeling, runs, sags • Poor finishes must be removed to substrate

  7. Determining Make-Up of Existing Area - Determining a Refinished Vehicle • Visual inspection • Signs of taping, shading, color of undercoating • Evidence of bodywork • Sanding

  8. Determining Make-Up of Existing Area - Determining a Refinished Vehicle • Measuring paint film thickness • Should not be more than 8-10 mils • 1 micron is 1/300 of a millimeter • 1 mil equal to 1/1000” (25 microns) • Typing paper is 4 mils, standard paint is 4-5 mils • Measure using a thickness gauge

  9. Compatibility - Selection of Applicable Paint • Acrylic urethanes and urethanes can be used over most old or refinished paints

  10. Paint Labels and Codes - Paint Code Labels • Have information on paint codes, trim codes, and interior colors • Information: • Type of paint • Upper and lower exterior paint • Trim combination

  11. Paint Labels and Codes - Location • Varies depending on make and model

  12. Paint Labels and Codes - GM

  13. Paint Labels and Codes - Ford

  14. Paint Labels and Codes - Chrysler

  15. Paint Labels and Codes - Toyota and Mitsubishi

  16. Paint Labels and Codes - Color Chip Books • List colors in numerical order according to factory code • Provide paint formula and color chip • Has a factory color use designation for each color code

  17. Paint Labels and Codes - Referenced Interior Colors • Available in 2 gloss levels • Flat colors required in all driver vision areas • Semigloss used in all other areas • Trim code tells basic color, type, and design

  18. Solvents - Definition and Function • Thinning paints is called reduction • Lacquer solvent is extremely strong • Enamel solvent is called reducer, basemaker, or stabilizer; weak solvent • Thinners and solvents lower viscosity of paint • Keep paint wet enough to flow

  19. Solvents - Definition and Function • Thinners and reducers are classified by evaporation at a given shop condition • Thinners and reducers affect color

  20. Additives - Function of Additives • Speed up or slow down drying time • Improve or lower gloss • Eliminate wrinkling • Faster cure • Chemical resistance

  21. Additives - Type of Additives • Hardeners • Initiators • Retarders • Flatteners • Flex additive

  22. Review of Undercoats - Types of Refinishing Undercoat Material • Precleaner • Metal conditioner • Filler • Primer • Primer-surfacer • Primer-sealer • Sealer

  23. Review of Undercoats - Considerations on Choosing an Undercoat • Composition of substrate • Condition of substrate • Type of substrate finish • Type of topcoat

  24. Types of Repair Topcoats - Lacquers • Nitrocellulose lacquer • Acrylic lacquer

  25. Types of Repair Topcoats - Enamels • Acrylic • Urethanes • Polyester • Polyoxithane • Waterborne

  26. Types of Repair Topcoats - Considerations for Selecting • OEM provides the best overall protection • Urethane finish second to OEM • Clean air regulation may require use of low VOC materials

  27. Types of Repair Topcoats - Two Types of Material Packaging • Factory packaged paint • Easier to match tints • Up to 160 tints • Intermix paints • Mixed by shop • Can be mixed to needs

  28. That Concludes Module 4B2

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