Protect panels, glass, interior parts, and other vehicles adjacent to the repair area

Lesson Planfor

CRT 130-1

NON-STRUCTURAL ANALYSIS AND DAMAGE REPAIR SECTION I

Course HS Title: / Non-Structural Analysis and Damage Repair / Program:
KCTCS Courses included in HS Title: (Lesson is prepared for course highlighted.)
KCTCS Course No. / KCTCS Course Title
Introduction/Context / This lesson will instruct the student on how toprotect panels, glass, interior parts, and other vehicles adjacent to the repair area.Knowledge of these techniques and the skills required to correct problems associated with this task are necessary for a student to acquire if they wish to compete for high paying, high skilled jobs in an Automotive Repair Facility. Entry level technicians need to be able to perform this task to 100% accuracy. Incorrectly performing this task can lead to an automobile accident or create customer satisfaction issues.
Prepared By / School / Date:
Grade Level / No. Students / No.IEP's: / Lesson Length:
Task
Protect panels, glass, interior parts, and other vehicles adjacent to the repair area
No. / Objective
1 / Given the proper tools and instruction, the student will be able to protect panels, glass, interior parts, and other vehicles adjacent to the repair area, and pass a written test covering the task with 100% accuracy.

Connections:

New Common Core:
RST 11-12-2
RST 11-12-3
New Common Core Technical
TD-SYS-1
TD-OPS-3
Skills Standards:
AA001
EG011

INSTRUCTIONAL MATERIALS/TECHNOLOGY

Teacher Designed Materials and Other Handouts

Textbooks and Workbooks

Author / Title/ISBN No. / Edition / Publisher / Pages
James Duffy / Auto Body Repair Technology / Thomson/Delmar / 810-824

Supplies

Quantity / Item / Source
As Needed / Paper (Masking Paper) / Various
As Needed / Safety Glasses / Various
As Needed / Plastic / Various
As Needed / Tape (Masking Tape) / Various

Equipment

Quantity / Item / Source
As Needed / Car Wash / Various
As Needed / Prep Station / Various
As Needed / Mits (Washing) / Various

Content/Presentation/Demonstration Outline

Instruct students on proper masking procedures. Masking keeps paint from contacting areas that are not meant to be refinished or painted. It is a very important step in the vehicle surface preparation process. Masking has become even more important with the advent of two-part paints. Once these paints dry, the overspray cannot be removed with a thinner or other solvent. Any overspray must be removed with a rubbing compound or by other time-consuming means. There are four basic ways to mask the parts of a vehicle: 1. With masking paper and masking tape; 2. With plastic sheeting and masking tape; 3. With specially shaped cloth or plastic covers (for wheels, the antenna, and rearview mirrors); 4. With liquid masking material.
Instruct students that traditional masking products may not work with water-based paints because of their high water content. If using water- based products, check with your supplier to determine which masking papers and tapes are made for use with these paints.
Inform students that before any types of masking materials are applied, the vehicle must be completely cleaned and all dust blown away. Masking tape and other masking materials will not stick to surfaces that are not clean and dry. It is important that the tape is pressed down firmly and adheres to the surface. Otherwise, paint will creep under it. It is wise to completely clean and detail the vehicle before masking and again after the refinishing job is completed. This is because masking over a dirty vehicle can cause a "dirty paint job".
Inform students about liquid masking. Liquid masking material seals off large, complex surfaces of the vehicle to protect them from paint overspray. It is the newest masking system available to painters. Liquid masking is used on areas where masking is necessary but difficult to apply, including wheel wells, headlights, the grille, the underbody chassis, and even the engine compartment. Masking liquid, also called masking coating, is usually water-based sprayable material for keeping overspray off body parts. Some are solvent-based. Masking liquid comes in large, ready-to-spray containers or drums. These materials are sprayed on and form a paint-proof coating over the vehicle. Liquid masking material is usually left on the vehicle until after buffing or compounding. When buffing compound sprays off the buffing pad, the masking coating will keep the compound from sticking to body surfaces. Since the masking coating washes off with soap and water, this will ease final cleanup.
Instruct students on proper procedure for liquid masking a vehicle. 1. Partially mask the area to be painted by going around it with masking paper. Fold the paper over onto the area to be painted. Secure the paper with masking tape. 2. Apply the liquid masking material. Use a heavy, single, overlapping coat. Apply the material to all surfaces that are not meant to be painted. This would include bumpers, grilles, doors, windshields, body panels, wheels, wheel wells, door jambs, and even the engine compartment. An airless spray system is generally recommended for applying the masking material. 3. Fold the masking paper back over the liquid masking material. Wipe away any material from the area to be painted with a damp sponge. Allow the surface to dry. 4. Prepare the surface. Then apply primer and paint according to the manufacturer's instructions. 5. Allow the paint to dry, and then unmask the vehicle. Liquid masking may be used in both air-dry or bake conditions. 6. After the paint is cured, wash off the dried liquid masking material with a garden hose or pressure wash.
Inform students about proper procedure for plastic sheet masking. Plastic sheet masking is very thin clear plastic that can be used to cover and protect large body surfaces. If one end or section of a vehicle is going to be painted, plastic sheet masking can be used to cover the other end of the vehicle to protect it from overspray. When using plastic sheeting, drape it over the vehicle. Do not let the plastic touch the ground and get dirty. Open the sheeting over the top of the vehicle and allow it to drape down over the sides. Lap the plastic sheeting under any masking paper. The masking paper should be applied over the masking plastic sheet. Poke a hole in the plastic as needed for an antenna or other obstruction so that the sheet lays flat. Tape down the corners of the plastic sheet so it cannot blow around with the wind or when spraying. Also mask any part sticking through the plastic sheeting.
Instruct students on proper procedure for applying masking tape and paper. Inform students that automotive masking paper is heat-resistant so that it can be used safely in baking ovens. It also has good wet strength, freedom from loose fibers, and resistance to solvent penetration. Automotive masking paper comes in various widths-from 3 to 36 inches (76 to 914 mm). Masking paper comes in different grades and colors: green, gold, gray, yellow, blue, and white. Some types of paper are designed for masking when priming. Others are designed for masking when painting. Make sure you use the correct type of masking paper as recommended by the manufacturer. Instruct students that if the painting environment is cold and damp, masking tape may not stick to glass or chrome parts. Condensation on them can prevent the tape from sticking properly. If the vehicle is not in an enclosed paint booth, dust will collect quickly on body surfaces. Blow and wipe the parts off before masking them to ensure good tape adhesion. When applying masking tape, hold and peel the tape with one hand. Use your other hand to guide and secure the tape to the vehicle. This provides tight edges. This also allows you to change directions and go around corners. Although masking tape is elastic, inform students to not stretch the tape too much when making a straight line. Overstretching can make the tape edges pull back up and leak paint spray. Only stretch masking tape when going around curved surfaces. Even then you should stretch the masking tape as little as possible while still following the curve of the part. To cut the tape easily, quickly tear upward against your thumbnail. This permits a clean cut of the tape without stretching. Tape down all loose paper and plastic to keep it from blowing around when spraying on the new finish. Use masking tape to hold down large areas of masking paper. Tape along the bottom of the vehicle to hold the paper on the bottom of the body.
Instruct students on possible masking problems. A masking leak problem is an opening in the masking material that allows paint overspray to hit and coat parts that were not supposed to be painted. Make sure all tape edges are tightly pressed down. If you leave any of the tape loose, overspray can blow under the masking paper and get onto glass, chrome, and other surfaces. You will then have to waste time using solvent or polishing compound to remove the overspray problem after the new paint cures. An over-mask problem results when you accidentally place the edge of masking tape over a surface that is supposed to be painted. Because the tape is positioned down over the panel, it will get painted. When you remove the tape a flaw will be evident in the over-masked area. Over-masked areas mean that the painter must retouch a part of the vehicle that should have been painted in the first place. On the other hand, under-masked areas must be cleaned with solvent or polishing compound to remove overspray. Each problem detracts from the appearance of an otherwise good job. Visually inspect all tape edges to make sure there are no gaps that could allow overspray leakage.
Inform students of other forms of masking. Double masking uses two layers of masking paper or a layer of tape over the paper to prevent bleed-through or finish-dulling from solvents. It is needed when spraying horizontal surfaces (hood, trunk, etc.) next to other masked horizontal surfaces. Overspray will tend to soak through a single layer of masking paper and onto the adjacent masked panel. This can damage the paint under the single layer of masking paper. Wheel masks are pre-shaped plastic or cloth covers that fit over the vehicle's wheels and tires. Plastic wheel covers are disposable and should only be used once. Cloth covers are reusable but should be cleaned off periodically. Back masking involves applying tape to the rear or inside edges of panels so that only the front of the panel is painted. When painting several panels, inform students that you often do not want paint to spray into gaps between panels. Spray would deposit on the panel surfaces and parts behind the gap or space between the panels. Reverse masking, or blend masking, is done by rolling the tape over and into a curved shape to prevent a visible, paint parting line along the masking tape. It requires you to fold the masking paper back and over the masking tape. The rolled edge of the tape will block most of the overspray, but a blended paint edge will be formed under the curved up tape. This technique is often used during spot repairs to help blend the painted area and make it less noticeable. This also helps prevent bleed-through. Masking rope is self-stick, foam rubber cord designed for quickly masking behind panels. Masking rope can be applied behind door, hood, gas cap lid, and other panels to block overspray. It provides a quick and easy way of blending paint behind panels.
When everything is masked, instruct students to walk around the vehicle while inspecting all of the masking material. Make sure there is no paper of plastic that could blow into the wet paint. Tell students to be sure and check for masking leaks or over-mask mistakes.

Applications/Practice

1 / Refer to content

Evaluation and feedback Prior to Testing or Lab Work

1 / Objective 1. / Formative assessment / Instructor will observe students as they practice the procedure to assure correct procedure and safety practices are being followed. A checklist will be utilized to chart student progress on the task. Questioning techniques will be utilized as necessary to demonstrate student comprehension / Adaptations and/or accommodations for special needs students will be added if required.

STUDENT ASSESSMENT:(Assess student progress with performance criteria.)

1 / Objective 1 / Summative assessment / written test questions on stated objective / adaptation and / or accommodations for special needs students will be added if required
IMPACT--Reflection/Analysis of Teaching and Learning: (How did students’ progress in relation to the state objectives? Was the instruction successful? Analyze samples of student work particularly that which is unsatisfactory, for the purpose of planning further instruction.)
REFINEMENT--Lesson Extension and Follow-up: (To be filled in as the lesson is modified during initial planning and/or during the teaching learning process.)