Repair options for rear quarter directly over wheel - ZR-1 Net Registry Forums

TexasZR1 · 05-26-2021

PO seems to have done a bondo repair of some damage to the rear quarter just over the left rear wheel. The bondo repair has failed and a crack is beginning to present in the paint.

This panel appears to be continuous across the back of the car (rear quarters and rear deck lid are one solid piece)?

My questions are:

Does anyone have experience removing this panel and replacing it? Is completely bolted in? Or bolted and sealed at edges? Are there any glued / epoxy seams of substantial strength?

What model years of ZR1 would be a matching donor for a 1990 (if it can be reasonably replaced)? Did the dimensions or fastening of this piece change at all from 1990 to later years?

Any guidance greatly appreciated!

32valvesftw · 05-26-2021

Give Gordon a call at Houston Corvette he should have experience with C4s. He did a great job painting my rear bumper.
http://www.houston-corvette.com/

We Gone · 05-27-2021

The rear quarter panel is replaceable in sections R & L with the seams under the halo down the rear of the door edge to the rub strip and at the gas cap door opening I am fairly sure the panels are the same 90-95, not a easy job as it is bonded on.

If you go with just repairing your panel be sure they use an SMC compatible product.

Good Luck.

TexasZR1 · 06-03-2021

Thanks very much for the reply.

I feel like the best course with this one is a replacement, as the underside is mush and it seems like they filled it with bondo, but maybe not much resin. So it would seem the old repair would need to be cut out? This would make matching the body lines pretty difficult and probanly still leave a weak spot prone to future issues.

I don't know what challenge it will be disbonding the panel from this one and a donor, but i can see how that could be easier than trying to perform the in place repair and make it look decent.

I believe i will be looking for a donor. Just need to set up the drive.

Another question that I think i know the answer to, but wish i was wrong on: are the quarters ZR1 specific? I'm guessing the extra width arrives at the edges, and not the middle for ZR1 vs. standard c4.

owwdee · 06-03-2021

Quarters are ZR-1 specific. I am about to do this exact same job on my 91. From my research, there is some trickiness to get the quarter unsandwiched from the halo. It is all bonded/glued.

I have both left and right quarters in off a ?90 (red) available if interested. I am in Denver. PM me if you?d like.

GOLDCYLON · 06-07-2021

This process is a SMC repair only. All SMC repairs start from the backside up vs. the Bondo from the top old school way. Without tackling the repair correctly the area will flex and crack just liked happened.

05-26-2021	#1
TexasZR1 Join Date: Oct 2018 Location: Houston Texas Posts: 48	Repair options for rear quarter directly over wheel PO seems to have done a bondo repair of some damage to the rear quarter just over the left rear wheel. The bondo repair has failed and a crack is beginning to present in the paint. This panel appears to be continuous across the back of the car (rear quarters and rear deck lid are one solid piece)? My questions are: Does anyone have experience removing this panel and replacing it? Is completely bolted in? Or bolted and sealed at edges? Are there any glued / epoxy seams of substantial strength? What model years of ZR1 would be a matching donor for a 1990 (if it can be reasonably replaced)? Did the dimensions or fastening of this piece change at all from 1990 to later years? Any guidance greatly appreciated! __________________ 1990 ZR1 #2184 BLK/BLK. Essentially stock. Plug-in Skip Shift Eliminator.

05-26-2021	#2
32valvesftw Join Date: Jun 2015 Location: Texas Posts: 530	Re: Repair options for rear quarter directly over wheel Give Gordon a call at Houston Corvette he should have experience with C4s. He did a great job painting my rear bumper. http://www.houston-corvette.com/

05-27-2021	#3
We Gone Join Date: Apr 2004 Location: ATL. GA. Posts: 2,162	Re: Repair options for rear quarter directly over wheel The rear quarter panel is replaceable in sections R & L with the seams under the halo down the rear of the door edge to the rub strip and at the gas cap door opening I am fairly sure the panels are the same 90-95, not a easy job as it is bonded on. If you go with just repairing your panel be sure they use an SMC compatible product. Good Luck. __________________ Steve 1990 Steel Blue/Black #2355 1990 Red/Red #1473 1991 Quasar /Black #118 Sold 1991 Turquoise/Black #766 Parted Out 1993 Yellow/White #179 Sold 1990 Black/Gray #1361 Headers/4:10s Sold

06-03-2021	#4
TexasZR1 Join Date: Oct 2018 Location: Houston Texas Posts: 48	Re: Repair options for rear quarter directly over wheel Thanks very much for the reply. I feel like the best course with this one is a replacement, as the underside is mush and it seems like they filled it with bondo, but maybe not much resin. So it would seem the old repair would need to be cut out? This would make matching the body lines pretty difficult and probanly still leave a weak spot prone to future issues. I don't know what challenge it will be disbonding the panel from this one and a donor, but i can see how that could be easier than trying to perform the in place repair and make it look decent. I believe i will be looking for a donor. Just need to set up the drive. Another question that I think i know the answer to, but wish i was wrong on: are the quarters ZR1 specific? I'm guessing the extra width arrives at the edges, and not the middle for ZR1 vs. standard c4. __________________ 1990 ZR1 #2184 BLK/BLK. Essentially stock. Plug-in Skip Shift Eliminator. Last edited by TexasZR1; 06-03-2021 at 01:32 AM.

06-03-2021	#5
owwdee Join Date: Dec 2015 Location: Colorado Posts: 69	Re: Repair options for rear quarter directly over wheel Quarters are ZR-1 specific. I am about to do this exact same job on my 91. From my research, there is some trickiness to get the quarter unsandwiched from the halo. It is all bonded/glued. I have both left and right quarters in off a ?90 (red) available if interested. I am in Denver. PM me if you?d like. __________________ 1991 ZR-1 #1900 Black/Black

06-07-2021	#6
GOLDCYLON Join Date: May 2007 Location: Peoria, AZ Posts: 9,153	Re: Repair options for rear quarter directly over wheel This process is a SMC repair only. All SMC repairs start from the backside up vs. the Bondo from the top old school way. Without tackling the repair correctly the area will flex and crack just liked happened. __________________ GOLDCYLON - 91 ZR-1 #2014 GOLDCYLON - 90 ZR-1 #2794, 4L60e (Formerly Schrade's) GOLDCYLON - 11 CTS-V Arizona State Director 91 WHITE/BLACK #2014. 380 P&P&PCed,Ported Heads, Jeal Long tubes, Corsa Exhaust/FIKSE FM-5s /LED TLs, LED Headlights, Front Wilwood 6 piston narrowlite calipers and rear Wilwood caliper street shop mod,CNCed Coolant Pipes,TPI Cvr,Filter cover,Stainless Bolts, DRM/DOM PROM /ZFDOC mod build #102,DRLs,BMAD with stainless Debris Screen,Coplan Air Blaster, Pioneer APP Radio 4,Brey-Krause HB,Sub Bar,Fire extinguisher seat mount,DRM Coilovers,LEDs everywhere,Compass mirror (orange),V1 DIC hidden display, Homelink sun visor, Carbon Fiber top x3 and APSIS Carbon Fiber interior, APSIS CF Steering Wheel/NAPA Leather, Banski trailing arms, Guldstrand front suspension,urethane bushings from Prothane (total suspension) ZFDoc drive shaft safety loop, raptor shift light (orange),AO engineering louver front plate, Console seat cushion, 96CE seats with black custom Sheepskins, ss billet catch can,Viper remote entry/alarm,Cragar Rear Louvers,LED side louver lights, Dewitts Radiator with SPAL fans and a Woods 160 T-Stat 90 RED/BLACK #2794. 4L60e Automatic Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless Headers, Corsa Exhaust, SAN Secondaries and Haibeck PROM, Exotic Muscle Coil overs, LED Interior Lights, LED Tail Lights, LED Headlights, 94 Sport seats with black custom Sheepskins , Cragar rear louvers, GS Front calipers, Banski Trailing arms, APSIS Carbon Fiber steering wheel, Front and Rear Baer Eradispeeds, DRLs, Guldstrand front suspension,urethane bushings from Prothane (total suspension), Dewitt's Raditor with Dual SPAL fans and a Haibeck 170 T-Stat 11 RED/GREY CTS-V