Page 21 of 3M Automotive Glass Products Catalog by 3M Automotive

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 is bonded to remaining film. When removing butyl tape or unknown materi- al, remove all old material from pinch- weld. 7. Prime any bare metal scratches with 3M Black Primer (Step 2) (P/N 08684 or 08686). NOTE: When excessive 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 08691) to the outer 3/4 inch of the glass with a clean wipe. Wipe off excess primer with a clean lint free cloth while still wet. 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 for at least 5 minutes. 11. If a foam dam was used in the OEM application it is suggested that foam dam material be replaced. 12. Cut tip to desired shape and size to provide a bead height sufficient to give good contact with the windshield around the entire perimeter. A triangular shaped notch will provide the desired bead shape and height. A height of 1/2 inch to 9/16-inch and a 1/4 inch- 5/16- inch base is suggested. NOTE: Where installing encapsulated glass, apply a bead high enough to assure glass con- tact before encapsulation contacts the car body and prevents further setting. Back paddling material after setting will not be possible. 13. Apply 3M Auto Glass Urethane Windshield Adhesive High Viscosity, or 3M Fast Cure Auto Glass Urethane, directly onto the OEM urethane film on the pinchweld or directly to the glass. 14. Position the glass by aligning the masking tape on glass and car body. Press glass in place to assure complete contact with the 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 an adhesive cleaner. Full Cut Method Without Dam Materials Using 3M Rapid Two-Part Auto Urethane Adhesive (RTP) Part Numbers 08533, 08534 The following instructions cover replace- ment procedure for urethane bonded automotive windshields using the full cut out procedure using 3M Rapid Two-Part Urethane. 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 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 is left on the pinchweld and fresh urethane is bonded to remaining film. When removing butyl tape or unknown materi- al, remove all old material from pinch- weld. 7. Prime any bare metal scratches with 3M Black Primer (Step 2) (P/N 08684, 08686). NOTE: When excessive 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, PN 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 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 of glass. Allow primer to dry for at least 5 minutes. 11. If a foam dam was used in the OEM application, it is suggested that foam dam material be replaced. If no foam dam was used it is suggested that the foam dam tape or 3M Foam Spacer Blocks, PN 08529 be applied to assist in setting the glass when using 3M Rapid Two-Part Urethane Windshield Adhesive (RTP). 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 1/4 to 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 impossible. 13. 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. 14. Paddle squeeze out around edge of glass if possible. If necessary, paddle additional adhesive between glass and car body to fill voids. 15. Remove masking tape alignment strips. 16. Replace moldings, windshield wipers and other trim removed in Step 1. 17. Clean any excess urethane with an adhesive cleaner. 20

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