How to pro­fes­sion­ally in­stall wind­shields and back­lites

Chevy High Performance - - Contents - TEXT: Jim Smart | PHO­TOS: Brian Bren­nan

How to pro­fes­sion­ally in­stall wind­shields and back­lites

Wind­shield and back­lite re­place­ment has al­ways mys­ti­fied en­thu­si­asts be­cause it is the wild/weird sci­ence of lay­ing lam­i­nated and plate glass onto a steel frame hop­ing it will suc­cess­fully seal out the weather and look good. For ages, wind­shields and back­lites were se­cured with a con­tin­u­ous rub­ber seal and non-cur­ing gooey black sealant. In the 1960s, GM went to glue-in wind­shields and back­lites that not only didn’t leak but also stayed se­cured to the body in a col­li­sion in the in­ter­est of safety. Wind­shields and back­lites held in with a rub­ber gas­ket had a ten­dency to pop out in col­li­sions, plac­ing oc­cu­pants in great dan­ger.

When you’re in­stalling glue-in glass, fol­low the man­u­fac­turer’s in­struc­tions to the let­ter. 3M makes great auto body prep prod­ucts, which are avail­able through a lot of sources, such as Sum­mit Rac­ing Equip­ment. We’re work­ing with 3M’s Fast Cure Auto Glass Urethane (PN 08690), which is a fast-cur­ing urethane wind­shield ad­he­sive and sealer de­signed for use with glue-in wind­shields and back­lites.

We’ve found that 3M Fast Cure Auto Glass Urethane is a sin­gle-stage mois­ture cur­ing urethane pro­vid­ing rapid strength build-up. You don’t have to wait for it to cure be­cause it is a high-strength ad­he­sive de­signed for use in full cutout in­stal­la­tions with­out damming ma­te­ri­als. It pro­vides the bond­ing strength re­quired for the in­stal­la­tion of ve­hi­cle wind­shields, back­lites, and sidelites. When fully cured, the 3M glass urethane meets the OEM strength re­quire­ments spec­i­fied by Chevro­let.

We’re at Hot Rods by Dean in Phoenix where we’re go­ing to show you the ba­sics of how to in­stall glue-in wind­shields and back­lites on a first­gen Ca­maro. You must first be­gin by thor­oughly clean­ing the con­tact sur­faces and re­mov­ing all of the old

ad­he­sive and any glass frag­ments. The sur­faces must then be primed with the ap­pro­pri­ate 3M primer com­pat­i­ble with 3M’s Fast Cure Auto Glass Urethane sealer. The primer seals any scratches at the pinch-weld where the glass sits to pre­vent rust. Once the primer has cured, make sure the glass con­tact sur­faces are clean. With good sur­face prep you’re ready for glass in­stal­la­tion, which must be me­thod­i­cally per­formed with close at­ten­tion to de­tail. Hot Rods by Dean will show you how. CHP

03 | The back­lite in­stalls the same way, with sup­ports (ar­rows) at the base of the glass, which en­sures proper glass place­ment. Check the fit be­fore lay­ing down the ad­he­sive. The guys at Hot Rods by Dean use mask­ing tape as a good ref­er­ence line.

05 | The sealer/ad­he­sive is ap­plied in con­ser­va­tive amounts be­cause you don’t want the stuff ooz­ing out around the perime­ter. Lay down a 1/4- to 3/8-inch bead and, with a helper, lay the glass in. Once the glass is laid in, us­ing the palms of you hands, care­fully press the glass into place around the perime­ter. Trim away any ex­cess sealer with a ra­zor blade be­fore the sealer has a chance to com­pletely cure.

02 | Test fit all glass be­fore ap­ply­ing the 3M Fast Cure Auto Glass Urethane sealer. Wind­shield in­stal­la­tion is nearly fool­proof be­cause GM pro­vides glass sup­ports at the base of the wind­shield. This ap­proach beats the socks off of the old rub­ber seals we used to work with in clas­sic Chevys. It was also a safety is­sue be­cause rub­ber gas­ket wind­shields and back­lites could pop out in ac­ci­dents. It also took less la­bor time to in­stall on the assem­bly line.

01 | Once you have cleaned all the wind­shield con­tact sur­faces to where they are hospi­tal clean— in­clud­ing the glass and pinch weld sur­faces— care­fully in­stall the wind­shield mold­ing clips. We got ours from Clas­sic Head­quar­ters. The chal­lenge here is to in­stall the clips with­out scratch­ing the paint. Note where the clip seats against the pinch weld and the tip that se­cures the stain­less trim.

04 | Hot Rods by Dean uses 3M Fast Cure Auto Glass Urethane sealer be­cause it is very for­giv­ing and cures quickly. Fol­low 3M’s in­struc­tions closely.

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