HELP! Advice needed for repairing cracks in body filler over widebody kit.

The Nissan 300ZX (Z32) general community discussion forum
NeoTokyo
Posts: 17
Joined: Tue May 23, 2017 4:04 am
Car: 1992 300ZX 2+2 5spd TT Swapped Wide Body

Post

Heya Everyone!

So this weekend I am going to start on the bodywork to get the Z ready for Primer.

There is a ton of cracking EVERYWHERE and I think they used just a standard body filler, nothing special.

I have never done body work before so this is new to me.

What is the best way to go about repairing the cracks in the body and building the filler back up in area's where large chunks WILL be coming off?


The rear quarter panels is what I worry most about, it is thick and the cracks are big.
This Z has been outside in the rain, unprotected for god knows how many years. I am expecting to have to cut back a lot to get to clean metal.
The front fenders have such large cracks that you can see the bare rust splotched metal underneath.

Can I just use a Dremel to widen the cracks going right down to metal and then fill with something like Dynaglass?

Which filler is best to use for this? I have been looking at DynaGlass, Evercoat or the 3M stuff.

I dont expect the cracks to never come back but I want to be able to fix it for now to throw some paint on it and make it look good for a few years.
Honestly the SpdV6 wide body kit has been my favorite for many years now, if I ever redo the whole thing, it will be with that kit.

Thanks everyone.

-Eric-

Image


Image


Image


User avatar
AZhitman
Administrator
Posts: 54542
Joined: Mon Apr 29, 2002 2:04 am
Car: 58 L210, 63 Bluebird RHD, 64 NL320, 65 SPL310, 66 411 RHD, 67 WRL411, 68 510 SR20, 75 280Z RB25, 77 620 SR20, 79 B310, 90 Z32, 91 GTi-R, 92 Silvia Qs, 98 S14, 23 Z.
Location: Surprise, Arizona
Contact:

Post

Those pics make me sad in pants. :(

So, I'll get someone with much more experience in paint/body in here soon, but the first thing to know is, fiberglass over metal WILL eventually crack. Period. I don't care if it's a million-dollar SEMA show car, or a drift missile, it'll crack.

Metal and fiberglass (and filler) expand and contract at different rates. They also flex differently. So, while a good bond and professional transitioning can forestall the cracking for a long time, it'll happen.

With that said, I'd have another concern: Most cars that were fitted with old-school fiberglass kits were done with a water-based filler, which means while the fiberglass dried from the outside, it laid up against the metal... for hours/weeks/months. Corrosion could be causing the cracking.

Now that I've pooped on the parade, let's get someone way smarter than me in here to help you fix it. :)

Welcome aboard!!

Seas05g35
Posts: 7
Joined: Thu Jun 23, 2016 11:19 pm
Car: 2005 infiniti g35

Post

Will ask around. I would say you may need to redo it based on looks and just because it's such an old job, but im not a professional. I'll see about getting someone in here as well.

User avatar
DCaff300ZX
Posts: 4202
Joined: Sun Jun 14, 2009 8:18 am
Car: .
1993 CRP TT- Modified
Location: Tacoma, Washington

Post

Sorry for the brutal honesty here, but this is a piece of junk. Anyone who knows cars would NEVER buy this wreck because it's just that: a wrecked car that was built in a way that no one with any sense would EVER do. To rebuild this mess would take more time and trouble than to build it right the first time.

NeoTokyo
Posts: 17
Joined: Tue May 23, 2017 4:04 am
Car: 1992 300ZX 2+2 5spd TT Swapped Wide Body

Post

AZHitman thank you for the detailed response, it was very helpful.

Seas I look forward to hearing back from you on what you find out.



DCaff so appearances make this Z a piece of junk?

Call me crazy but when I am looking for a track car IDAF about looks.

It runs great and drives, it does not have mechanical problems, the turbo's boost perfectly and it is an AWESOME steal for $500 dollars for a starting point of a track car.

I bought it for AutoX and some trips to Thunder Hill, not because I wanted a perfect example of a factory Z.
I will fix the body kit the best I can, I have no high hopes of a show car, what I do have high hopes for is Fun.

User avatar
NolimitZ32
Posts: 7042
Joined: Fri Jun 27, 2008 9:07 am
Car: 91 AG2 2+0 TTMT swap/E39 BMW 540i6/E53 4.6is Dinan S3
Location: Houston, TX

Post

I've been doing a little research recently into urethane fillers, there are lots of different flexible fillers on the market, the issue that you'll run into just as AZHitman pointed out is getting the fiberglass, metal, and filler to play nice with each other. Sorry I can't be of more help.

NeoTokyo
Posts: 17
Joined: Tue May 23, 2017 4:04 am
Car: 1992 300ZX 2+2 5spd TT Swapped Wide Body

Post

NoLimit the help is appreciated greatly. :)

What have you found about urethane fillers, their flexibility and maybe complimenting paints that also have some flexibility to them.

I picked up a Bondo Brand fiberglass repair kit to work on the front bumper. Structurally speaking, the front end is actually very solid, so I figured that I would repair it for the time being and gather parts for a later front end swap back to OE/99.

User avatar
NolimitZ32
Posts: 7042
Joined: Fri Jun 27, 2008 9:07 am
Car: 91 AG2 2+0 TTMT swap/E39 BMW 540i6/E53 4.6is Dinan S3
Location: Houston, TX

Post

I'm not going to go into details since I'm no authority on the matter but the main thing is to figure out what prep bonds with what materials, there are primers, sealers, and tackifiers for every material, getting the right mix and applying properly seems to be the key, have a look around autobody101 for suggestions and info.

User avatar
DCaff300ZX
Posts: 4202
Joined: Sun Jun 14, 2009 8:18 am
Car: .
1993 CRP TT- Modified
Location: Tacoma, Washington

Post

NeoTokyo wrote:AZHitman thank you for the detailed response, it was very helpful.
DCaff so appearances make this Z a piece of junk?

It runs great and drives, it does not have mechanical problems, the turbo's boost perfectly and it is an AWESOME steal for $500 dollars for a starting point of a track car.

I bought it for AutoX and some trips to Thunder Hill, not because I wanted a perfect example of a factory Z.
I will fix the body kit the best I can, I have no high hopes of a show car, what I do have high hopes for is Fun.
No, read AZHitman's assessment which is also my assessment- FAR too much trouble for a cost-effective fix, and SOOOO many further problem awaiting you.
My advice is based on my own past experiences, and what would be the best route.
BTW, I'm 52 now and have had SO many cars in my time it's scary. They've run the gamut from nice to not-so nice, and I've probably faced nearly every issue known to pre-90's vehicles.
I've learned a lot and now adhere completely to what I know, and try to share that knowledge.

You say it runs and drives great, but you've also filled the tech section with problems and we have advised you on those...and be ready for lots more troubles along the lines of your current ones. Someone obviously dumped their parts supply on this doomed beast and got a few bucks out of it to some unsuspecting kid (you), and here you are.
How do I know?
Been there, done that many years ago with a '80's 280ZX custom-bodied missile, almost exactly like the one you have. Looked a million bucks but like yours, was cracked and faded badly but ran decently if needing "a tuneup" as the salesman said and sounded awesome with the custom exhaust (which fell off a week later!).
So, I had the same bodywork and issues, same "works great" sales pitch followed by every old, cobbled system failing within a month and at most, a year. The body was helpless, as to beat past all of the cracking and further rust issues underneath would have been VERY difficult and expensive, costing FAR more than I paid for the car and that AZHitman alludes to. Next, the engine was a mess of old parts from other cars, poorly/quickly/incompetently (no gaskets or sealing at times!) installed, LOTS of old cracking vacuum hoses and wiring, plus the engine had a ton of miles on it...swap time. The car leaked water horribly (sold/bought in the summer!) which of course was the body issue, and more.
Basket case! Sold as parts and re-learned a valuable lesson on other peoples' projects.
My first "lesson" ?
My very first car, a '67 big block Mustang Fastback I HAD to have and spent every penny I had on, that went much the same route- a drag missile built poorly and incompetently, LOTS of bondo to crack later, and tons of "old car" issues needing attention that mostly it never got. I was focused on how it ran, and not the "other" stuff...finances available and lack of experience with what to do and how were my excuse until it went away in parts. Sound familiar?
I know this story like I know how to breathe.

So, I stand by my assessment and you have backed it up with all of your current problems, plus the ones you haven't even dreamed of yet but which are the Z32's specialty!
Have fun, and Good Luck! :chuckle:

NeoTokyo
Posts: 17
Joined: Tue May 23, 2017 4:04 am
Car: 1992 300ZX 2+2 5spd TT Swapped Wide Body

Post

Your story is not my story and your assessment does not apply.

Just because you cant see past some cosmetics and a couple simple and relatively cheap fixes, you would have this Z slaughtered, parted out to feed some other project probably not much different than her. She is an old build that was neglected for one reason or another, but I can say it was not because she wasn't road worthy. Her issues are from sitting idle for far too long. Cars need constant attention, otherwise they rot away like bitter old men.


You want to talk about owning a lot of cars, here is my car list, in order from when I was 18 to now at 35.
My truck is the only vehicle I ever bought new off the showroom floor, not worth it imo.
I did part out a couple of these vehicles because there was more to be made that way than selling it as a driver.

You may notice a trend. lol

1970 Chevelle Malibu 2 door hardtop - 396 from a 1966 Impala SS - Mildly built pushing about 425hp - It was a driving project.
1975 El Camino 350 crate.
1987 Thunderbird ( 3.8L V6 )
1995 Mustang 3.8L V6 5spd
1993 300ZX 2+2 Auto
1996 Mustang V6 5spd (This one turned into a heavily modified Mustang that I still have)
2005 F150 FX4 Scab
1991 300zx 2+2 Auto
1996 Honda Civic DX
1997 Cobra
2001 Mustang V6
2001 Cobra
2000 Mustang V6
2001 Mustang GT 5spd
1992 Miata AB Package 5spd
1995 Coachmen 36' Class A RV (never again, lol)
1999 Subaru Outback
1968 Mustang Coupe - FRPP 306 crate motor, T5 Transmission - This was another driving project like my Chevelle.
2004 Ford Freestar 3.8L
1995 Mustang GT 5spd
1999 Ford Explorer 5.0L Eddie Bauer
1999 Yukon Denali (Still own)
1992 300ZX 2+2 5spd TT swapp


I think my point is pretty clear here, I know what I am doing and have history and experience to back it up.
Do not fault me as some inexperienced kid for coming to a forum and asking questions before moving forward with something, I don't like to do work twice because I was too stubborn to ask for help.

User avatar
NolimitZ32
Posts: 7042
Joined: Fri Jun 27, 2008 9:07 am
Car: 91 AG2 2+0 TTMT swap/E39 BMW 540i6/E53 4.6is Dinan S3
Location: Houston, TX

Post

Gentlemen, play nice please, no one knows anyone else's whole story. We on this forum and many others run into kids spending their last dollar on these cars expecting excellence but getting only pain. Neo you're old enough and seemingly experienced enough to know better so I trust that you know what you've gotten yourself into. So lets get this thread back on topic of serious body mod repair or lets let it die.

NeoTokyo
Posts: 17
Joined: Tue May 23, 2017 4:04 am
Car: 1992 300ZX 2+2 5spd TT Swapped Wide Body

Post

Thanks NoLimit, I do recognize your name from when I use to read through these forums a lot, aren't you in another Z forum too? Its been a while.

Anyways, I understand what I was getting into with this car, it took me almost a month of thinking it over before I even went to see it.
Seeing it in person, hearing it and feeling it was what sold me. She looks worse than she is, thats the only reason why I got a good deal.

My Ex wife even told me to leave it alone, don't even waste my time and she is the one that bought the 93' and 91' Z in my list.
But after she got to see it in person and experience it, she was also instantly sold.
I trust what my Ex has to say about cars, we have known each other since we were 13 and ran a Mustang parts business together.

This Z is the perfect start for what I want and very much worthy of a basic restoration.
I always wanted a TT swapped 2+2 and there she was, a diamond in the ruff.

User avatar
NolimitZ32
Posts: 7042
Joined: Fri Jun 27, 2008 9:07 am
Car: 91 AG2 2+0 TTMT swap/E39 BMW 540i6/E53 4.6is Dinan S3
Location: Houston, TX

Post

I am a part of a couple other forums but I'm not active on any like I am on this one, and I have been here for a while, since my first Z when I was like 17.


Return to “300ZX (Z32) General”