Re: How to Repair Rust
[Re: QuickDodge]
#2555285
09/26/18 11:11 PM
09/26/18 11:11 PM
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Joined: Jul 2011
Posts: 960 Chicago
PurpleBeeper
super stock
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super stock
Joined: Jul 2011
Posts: 960
Chicago
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I still use fiberglass & I've been using a "short hair" fiberglass-type "bondo". Poorboy is right, fiberglass mat/resin just slapped on top of rusty metal isn't good. Personally, I have been welding in as many metal patches as possible, but I still need to short hair fiberglass & bondo the seams of the patches to get everything smooth.
Last edited by PurpleBeeper; 09/26/18 11:14 PM.
70 Roadrunner convt. street car
440+6, NOS, 4-spd, SS springs
'96 Mustang GT convt. street car
'04 4.6 SOHC, NOS, auto, lowered
"Officer, that button is for short on-ramps"
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Re: How to Repair Rust
[Re: QuickDodge]
#2555537
09/27/18 01:58 PM
09/27/18 01:58 PM
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Joined: Jul 2003
Posts: 4,785 Holland MI Ottawa
2boltmain
master
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master
Joined: Jul 2003
Posts: 4,785
Holland MI Ottawa
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Fiberglass was an easy cheap way for high school kids in the 70s 80s even 90s to do a weekend (most of the time awful quality resto) resto of a rotted out muscle car. Paint it white to not show off the flaws! But when done correctly it lasts a looooong time.
Keep old mopars alive.
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Re: How to Repair Rust
[Re: QuickDodge]
#2555538
09/27/18 02:00 PM
09/27/18 02:00 PM
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Joined: Mar 2003
Posts: 4,848 Memphis
HemiRick
master
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master
Joined: Mar 2003
Posts: 4,848
Memphis
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I fixed the base of the rear window in my Charger w fiberglass when I was 18, I'm 55 now and the repair is still working great ! Clean and no rust is the key.
Take care, Rick 68 Coronet R/T 440 & 68 Charger 528 Hemi,and 5 Challengers! 6 cyl, 318, 360, 383, 451
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Re: How to Repair Rust
[Re: QuickDodge]
#2556236
09/29/18 12:22 PM
09/29/18 12:22 PM
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Joined: Dec 2003
Posts: 10,938 Spokane Valley, WA
Big Bad Bee
I Live Here
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I Live Here
Joined: Dec 2003
Posts: 10,938
Spokane Valley, WA
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The thermal properties of fiberglass are not the same as steel. It heats up and cools much faster thus, it expands and contracts at a different rate. This affects the bond when exposed to rapid heat, cooling and vibration, and there’s the key: Bond. Fiberglass repairs are only as good as the bond. Welding takes two pieces of steel and effectively makes them one. For what it’s worth, if I were replacing rusted metal and couldn’t weld, I would buy a steel repair panel, flange the edge of the area needing repair, and bond it using panel bonding adhesive. If you live in the north, don’t use glass.
I’m listening.
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Re: How to Repair Rust
[Re: QuickDodge]
#2556242
09/29/18 12:32 PM
09/29/18 12:32 PM
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Joined: Sep 2003
Posts: 19,534 north of coder
moparx
"Butt Crack Bob"
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"Butt Crack Bob"
Joined: Sep 2003
Posts: 19,534
north of coder
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before my old man passed, he had a 1990 dodge dynasty front drive. one day before the required state inspection, he came over to my shop asking me to look at his wet carpet under the gas pedal. this was at the end of february, and a ton of snow and salt on the roads. when i looked, there was a big chunk of floor pan missing, and the carpet backing was peeking through the hole. great, just what i needed, a big inspection repair the day before the sticker ran out ! [but that was the old man's way. ] i jacked up the car, wiped the salty slush off the bottom of the floor pan with a dirty shop rag, and slathered on a bunch of resin around the hole. waited for it to start kicking off, then soaked a patch with resin and slammed it home, tucking some of the patch inside the hole. let that kick, then mixed up some "hair" with extra hardener, then slathered that around until the depression was kinda filled. when that mess started to harden up, and was not moveable, out came the damp weather apply roof tar. smeared that around so it looked like "factory seam sealer" [kinda ]. this took all of about 40 minutes. told pappy to go out & ride around a bit in the slop to get the "patch" dirty before he took it in for a sticker the next day. that mess set up and lasted three or four years until he traded up to a different ride. looked as "good" then as it did the day i did it, and was rock hard ! sometimes it seems that if you don't care about how you fix something, it lasts forever. when you really try to do a perfect job, it falls apart in a week. go figger !
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