ITI Mechanic Auto Body Painting (AITT Theory) study guide
ITI Mechanic Auto Body Painting (AITT Theory) · Work through your exam, one topic at a time.
The ITI Mechanic Auto Body Painting (AITT Theory) is the theory paper of the All India Trade Test for trainees who have completed the Mechanic Auto Body Painting trade under the Craftsman Training Scheme at an Industrial Training Institute. It is written for apprentices and ITI trainees who have finished workshop instruction in refinishing and now need to demonstrate that they understand the underlying principles, not just the hand skills. The ITI Mechanic Auto Body Painting (AITT Theory) study guide has 9 sections and about 2,982 words.
01Trade Safety, Tools, and Workshop Practice
The AITT theory paper checks that you can work in a body shop without injuring yourself or others: PPE selection, booth and ventilation rules, compressed-air safety, hand and power tool handling, fire prevention, housekeeping, and safe start-up and shutdown of spray equipment. Wear the right PPE: nitrile gloves for paints and solvents, chemical goggles, coveralls, and an organic-vapour respirator for solvent-borne materials.
370 words, about 2 min02Surface Preparation and Substrate Assessment
Substrate identification, cleaning, damage assessment, sanding, feathering, bare-metal treatment, and adhesion promotion before primer. The exam expects a logical preparation sequence, not random sanding.
341 words, about 2 min03Paint Materials, Mixing, and Color Matching
Paint systems, mixing ratios, pot life, viscosity, reducers and hardeners, colour theory, variant selection, and blending. Read the technical data sheet for every product.
337 words, about 2 min04Spray Application Techniques and Equipment
Spray-gun types and setup, fluid tip and air cap selection, fan pattern, distance, overlap, speed, triggering, viscosity, and booth airflow. A gravity-feed HVLP gun is common for refinish.
353 words, about 2 min05Body Filling, Panel Repair, and Dent Removal
Dent repair, metal finishing, body filler selection and mixing, application, sanding, panel replacement, and corrosion protection. Remove the cause of the dent where possible.
343 words, about 2 min06Primers, Sealers, and Undercoats
Primer types, surface preparation, film build, flash-off, sanding, sealing, and isolating substrates. Match primer to substrate and purpose: etch primer for bare steel and aluminium, epoxy for corrosion protection and bare metal, urethane primer-surfacer for filling and sanding, and sealer for colour hold-out and isolating old finishes.
311 words, about 2 min07Topcoats, Clearcoats, and Finishing Defects
Basecoat, metallic control, clearcoat application, curing, defect identification, and polishing. Apply basecoat in thin, even coats to hiding.
322 words, about 2 min08Health, Environment, and Waste Management
Isocyanate and solvent hazards, PPE, ventilation, safety data sheets, spill response, waste segregation, and disposal rules. Two-pack paints and clears contain isocyanates.
305 words, about 2 min09Measuring, Estimating, and Customer Handover
Damage assessment, repair-versus-replace decisions, labour and material estimating, blend panels, documentation, and customer handover. Inspect the whole panel, not just the visible dent.
300 words, about 2 min