Auto Body Reconditioning Materials

The primary purpose of auto body reconditioning materials is to:

Increase engine horsepower Restore damaged vehicle surfaces to an acceptable cosmetic and protective condition Improve tire traction only Lubricate suspension components

Abrasive paper with a LOW grit number (e.g., 80 grit) is best described as:

Fine finishing paper Coarse paper used for heavy material removal Very fine paper for final polishing Unsuitable for body filler sanding

Which abrasive is MOST suitable for final sanding before topcoat application?

36–40 grit on a body file 80 grit on a block 320–600 grit on a sanding pad, as recommended by the paint manufacturer 24 grit grinding disc

The numbers printed on the back of coated abrasives indicate the:

Sheet colour code Grit size and backing weight Manufacturing date only Maximum allowable speed

Feather edging refers to:

Adding feathers to the paint for texture Gradually tapering old coatings so there is no hard edge under new paint Painting only along the body line Masking the edge of a panel

Non‑woven conditioning discs (e.g., surface conditioning pads) are commonly used to:

Grind welds flush Remove heavy rust only Clean and scuff surfaces without cutting deep scratches Polish glass

A dual‑action (DA) sander is preferred for many refinishing operations because it:

Only spins in one direction Combines rotary and orbital motion to reduce swirl marks Is used only for cutting compound Cannot remove material

The main purpose of body filler is to:

Replace structural metal strength Provide a smooth, sandable surface to correct minor imperfections after proper metal repair Act as a rust converter Seal glass to the body

Polyester body filler should be mixed with:

Water to control thickness Epoxy hardener The correct peroxide hardener in the ratio specified on the product label Any available catalyst

Improper ratio of body filler to hardener (too much hardener) may result in:

Slower curing and soft filler Normal cure rate with no problems Excessive heat, porosity and potential cracking or staining of the topcoat Reduced odour only

Before applying filler, the metal surface should be:

Lightly oiled to improve adhesion Cleaned, bare metal with appropriate coarse scratch profile and free of rust and contaminants Painted with enamel Coated with silicone-based polish

Etch primers are designed to:

Provide high-build surfacing only Chemically bite into bare metal to improve adhesion and corrosion resistance Act as a final clearcoat Be applied over wax and grease

High‑build primer surfacers are primarily used to:

Provide colour to the panel Seal glass edges Fill minor sanding scratches and small surface irregularities Reduce dry time of topcoats

Sealers are applied before topcoats mainly to:

Add structural strength Act as a barrier coat, improving adhesion and colour uniformity Replace body filler Increase solvent content of the system

Acrylic urethane topcoats typically require:

Only reducer, no hardener Correct hardener/activator and reducer combination specified by the manufacturer Water as the only reducer No mixing; they are ready to spray from the can

The term VOC in refinishing materials stands for:

Vehicle Operating Cost Volatile Organic Compounds Variable Output Colour Viscosity of Coating

When selecting refinishing materials, the parts technician must consider:

Colour name only Compatibility of primers, sealers and topcoats within the paint system Price only Age of the vehicle only

Solvent popping in a topcoat is MOST often caused by:

Too little reducer and low temperature Excessive film thickness or fast flash times trapping solvents Sanding with the correct grit Using a compatible hardener

A tack rag is used immediately before spraying to:

Polish the clearcoat Remove dust and lint from the surface Apply wax Neutralize static in the paint

The safety data sheet (SDS) for a refinishing product provides:

Colour formulas only Detailed information on hazards, handling, PPE and first aid Blend panel instructions only Mixing ratios only

Respiratory protection for 2K urethane products should:

Be unnecessary in a ventilated shop Meet the manufacturer’s recommendations, often including supplied-air or appropriate cartridge respirators Be a simple dust mask only Use no filters

Featheredging into OEM e‑coat should be followed by:

Direct topcoat application with no primer Appropriate primer/sealer system compatible with both e‑coat and topcoat Application of silicone polish Wet sanding with 36‑grit paper

Blend zones are used when:

Applying filler to structural parts Matching colour by gradually fading new paint into adjacent panels Masking windows Sanding welds

Clearcoat is primarily used to:

Provide only structural rigidity Provide gloss, depth of colour and additional environmental protection Eliminate the need for primer Replace basecoat colour

Single stage paint systems differ from basecoat/clearcoat systems because single stage:

Has no pigments Combines colour and gloss in one coating Uses only water as a solvent Cannot be polished

Waterborne basecoats require particular attention to:

High solvent content Proper airflow and flash times for drying Use of acid etch additives Mixing with lacquer thinner

When mixing paint, the technician should use:

Guesswork based on experience only The mixing ratios and scales specified on the label or mixing system Any container with no markings Only volume estimates by eye

Contaminants such as silicone or oil on a panel often cause:

Improved adhesion Fish‑eyes or craters in the paint film Faster drying Lower gloss but no defects

To correct minor runs in clearcoat after curing, a common method is to:

Add more reducer to the clear Wet sand the defect with fine paper and polish Heat the panel until the run disappears Apply more clear over the run without sanding

Masking tape used in refinishing should:

Be ordinary household tape Be automotive grade to withstand solvents and baking temperatures Contain silicone release agents Always be duct tape

Filler that is applied over paint instead of bare metal will MOST likely:

Bond more strongly Fail prematurely due to poor adhesion Be easier to sand Require less hardener

A guide coat is used during block sanding to:

Change panel colour Reveal highs and lows or sanding scratches in the surface Seal the filler Increase gloss

Thinners and reducers are primarily used to:

Increase film build Adjust viscosity and spray characteristics Increase pigment content Neutralize hardener

The ILM Auto Body Reconditioning Materials module emphasizes that parts technicians should:

Recommend any product regardless of system compatibility Understand basic functions of abrasives, fillers, primers and topcoats to supply correct materials Avoid answering any technical questions Only sell pre‑mixed aerosol paints

When disposing of leftover paint and solvents, the correct practice is to:

Pour them down a floor drain Follow environmental regulations and shop procedures for hazardous waste Evaporate them in open containers Mix with used engine oil

Specialty abrasives such as foam pads and scuff pads are MOST often used for:

Grinding welds Conforming to contours and preparing blend areas or jambs Cutting glass Removing structural rivets

A mixing board for body filler is typically made of:

Raw cardboard that can absorb resin Non‑absorbent material such as plastic or metal to maintain proper mix ratio Unfinished wood Paper towels

Overspray on adjacent panels is BEST minimized by:

Using no masking at all Proper masking techniques and gun adjustment Increasing air pressure excessively Spraying from a greater distance than recommended