Page 20 of 3M Automotive Glass Products Catalog by 3M Automotive

3M Automotive Windshield Replacement Procedures These instructions describe the proper use of 3M Auto Glass urethanes and related 3M glass shop products and are intended for use as a supplement to detailed service manuals and instruc- tions provided by automotive manufac- turers. Automobile manufacturers instructions should be followed when removing automotive trim and moldings as well as other special requirements pertaining to specific car models. Note: The products and procedures presented here may be applicable to quarter and backlite replacements. However, for detailed instructions by car model, you should refer to information available from the automobile manufac- turer. Full Cutout Method With Dam Materials Using 3M Auto Glass Urethane-Medium Viscosity Part Numbers 08693, 08695, or 08564 The following instructions cover replacement procedure for urethane bonded automotive windshields using the full cut out procedure with dam material. The dam material provides the proper setting height. 1. If necessary, remove windshield wiper arms and trim necessary to expose the entire perimeter of glass. 2. Clean dirt and debris from around the pinchweld area before cutting out the glass and again after the glass is cut out to minimize contamination. 3. Cut into existing urethane around entire perimeter of glass with a utility knife. Cut as close to edge as possible. 4. Cut out glass with appropriate removal tools keeping as close to the glass as possible. Remove the glass and repeat Step 2. 5. Dry set the glass. Align for uniform fit and adjust setting blocks as needed for best fit. To allow for sufficient bonding of urethane, make sure there is a MINI- MUM of 1/4 inch of glass, in addition to the space that will be taken up by any dam material, around the entire perime- ter of the glass. Mark location by apply- ing masking tape to windshield and car body. Slit tape at edge of glass. Remove windshield. 6. Remove major portion of old ure- thane adhesive from the pinchweld. Use a razor blade knife or utility knife to prevent scraping paint off the pinchweld and exposing bare metal. NOTE: On urethane installations, it is recommend- ed that a thin film of the old urethane be left on the pinchweld and fresh urethane bonded to remaining film. When removing butyl tape or unknown material, remove all old material from pinchweld before applying fresh ure- thane. 7. Prime any bare metal scratches with 3M Black Primer, (Step 2) (P/N 08684, 08686). NOTE: When exces- sive abrasive cleaning is required, prime pinchweld metal with a 2 part epoxy automotive paint primer and allow to cure properly. Apply 3M Black Primer (Step 2) to repaired area and allow to dry for at least 5 minutes. 8. Clean inside surface of glass with 3M Glass Cleaner, P/N 08888 taking care to clean surface where the ure- thane bond will be made. 9. Apply a thin film of 3M Clear Primer (Step 1), (P/N 08683, 08685 or P/N 08691) with a clean wipe. Wipe off excess primer while still wet with a clean lint free cloth. Allow primer to dry for at least 5 minutes. (Repeat, Step 9) 10. Apply 3M Black Primer (Step 2) (P/N 08684, 08686, or 08692) over the primed 3/4 inch of glass. Allow primer to dry for at least 5 minutes. 11. Apply dam material to inside edge of pinchweld or 3M Foam Spacer Blocks, PN 08529. 12. Cut tip to desired shape and size large enough to be slightly higher than the dam material. A triangular shaped notch will provide the desired bead shape and height. A height of 1/2 to 9/16-inch and a 1/4 - 5/16-inch base is suggested. NOTE: When installing encapsulated glass, apply a bead high enough to assure glass contact before encapsulation contacts the car body and prevents further setting. Back pad- dling material after setting will not be possible. 13. Apply 3M Auto Glass Urethane Windshield Adhesive - MV directly onto the remaining OEM urethane film, behind and contacting the dam material. 14. Position the glass by aligning the masking tape on glass and car body. Press glass in place to assure complete contact with dam material and urethane adhesive. 15. Paddle squeeze out around edge of glass if possible. If necessary, paddle additional adhesive between glass and car body to fill voids. 16. Remove masking tape alignment strips. 17. Replace moldings, windshield wipers and other trim removed in Step 1. 18. Clean any excess urethane with adhesive cleaner. Full Cut Method Without Dam Materials Using: 3M Fast Cure Auto Glass Urethane- (High Viscosity) Part Numbers 08689, 08690, 08566 or 3M Auto Glass Urethane-High Viscosity Part Numbers 08696, 08698, 08565 The following instructions cover replacement procedure for urethane bonded automotive windshields using the full cut out procedure without the use of a dam material. High viscosity urethane products provide windshield support while the cure is attained to provide structural strength. 1. If necessary remove windshield wiper arms and trim necessary to expose the entire perimeter of glass. 2. Clean dirt and debris from around the pinchweld area before cutting out the glass and again after the glass is cut out to minimize contamination. 3. Cut into existing urethane around entire perimeter of glass with a utility knife cutting as close to edge of the glass as possible. 4. Cut out glass with appropriate removal tools keeping as close to the glass as possible. Remove windshield and repeat Step 2. 5. Dry set the glass. Align for uniform fit and adjust setting blocks as needed for best fit. To allow for sufficient bonding of urethane, make sure there is a MINIMUM of 1/4 inch of glass, in addition to the space that will be taken up by any dam material, around the entire perimeter of the glass. Mark location by applying masking tape to windshield and car body. Slit tape at edge of glass. Remove windshield. 19

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