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06-26-2019, 09:37 AM | #1 |
Questionable
Join Date: Mar 2005
Location: Atlanta
Posts: 13,376
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How to handle - Floor surface rust
Shy of replacing the foam gasket on the fresh air intake of my GMT400, I fixed all water leaks in my truck. Now I need to clean up the damage of PO ignoring them.
I'm installing tar-like adhesive-backed sound deadening mat (Dynamat) on my cab floor, but I want to deal with some rust first. What's the best way to handle these bubbled up and surface-rusted spots before installing the mat? Sand, self-etch prime or rust bullet/POR15/similar rust sealer? Paint over that? How long should I wait after treating and paint before installing the mat? Any "aha!" things I should know about, like the rust at the seam sealer up front? Feedback is appreciated. Looking to get this started soon. Pics, hopefully the forum doesn't make them too "potato" quality, if it does, I'll post better close-ups later today. (edit: Yup, it potato'd them out, I'll post better hi-res pics in a few hours)
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If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM. |
06-26-2019, 02:16 PM | #2 |
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Re: How to handle - Floor surface rust
I'd take a sanding disc and clean the spots to bare shiny metal....then put epoxy primer on those spots..
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Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver Last edited by mongocanfly; 06-26-2019 at 06:20 PM. |
06-26-2019, 06:09 PM | #3 |
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Join Date: Mar 2005
Location: Atlanta
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Re: How to handle - Floor surface rust
Here we go, here's a better shot. Especially along the body seams.
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If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM. |
07-05-2019, 10:27 AM | #4 |
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Join Date: Oct 2015
Location: Calgary, Alberta
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Re: How to handle - Floor surface rust
Your floor has been painted previously without using epoxy primer. Epoxy primer prevents rust "creep" which is exactly what's happening to your truck.
Because we know there's no epoxy primer, I'd reccomend stripping all loose paint to bright metal and apply epoxy primer as Mongo suggested. If you are more determined and enthusiastic, you might consider stripping all coating on the floor and then apply an epoxy over the entire area. Once the epoxy is dry in 24 hours, you can apply paint or just put the Dynamat over the epoxy. If chose any product other than "epoxy primer" you are wasting your time and money as there's no substitutes for what epoxy primer does.
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So when is this "Old enough to know better" supposed to kick in? My 1959 GMC build thread http://67-72chevytrucks.com/vboard/s...d.php?t=686989 |
07-05-2019, 11:20 AM | #5 |
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Join Date: Jul 2015
Location: Central Coast, CA
Posts: 498
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Re: How to handle - Floor surface rust
I'm obviously not an auto body expert but I can say these Polycarbide Abrasive Wheels from HF work really well for removing the rust and surrounding paint without removing as much metal as say 40 grit.
I ended up buying one of HF's $12 angle grinders to use with these wheels as my good 15 amp angle grinder is too powerful - their cheap one (item #60625) is only 4.3 amp - also I've heard the dust from these disks is not good for the angle grinder, so for $12 it is hard to go wrong. The wheels come is 4-1/2", 4", 3" and 2" and are rated to 11,000 rpm. The 4-1/2" wouldn't fit on the 4-1/2 angle grinder as it hits the guard; but the 4" one does fit. Those welds are interesting in the photos - are those done by welding robots in the GM factory? They are good looking welds. |
07-05-2019, 01:11 PM | #6 |
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Re: How to handle - Floor surface rust
Gromit....that's seam sealer....not welds
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Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver |
07-05-2019, 06:31 PM | #7 | |
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Join Date: Mar 2005
Location: Atlanta
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Re: How to handle - Floor surface rust
Quote:
I've got all the tools to take the paint up, now I know what to use. Only other concern is whether I need to do anything special at the body seams, you can see the rust rolls right under the seam sealer in a few spots. For whatever it's worth... This rust is courtesy of the massback under the carpet staying saturated for years under the previous owner's watch (cowl/3rd brake light water leaks). It only dried out after I got the truck, removed 3 of 4 seats, folded up the carpet and put it in the blaring sun with the windows down all day for several weeks. Recently pulled the carpet to see how bad it was ... yeah.
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If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM. |
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07-05-2019, 07:05 PM | #8 |
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Re: How to handle - Floor surface rust
I'd remove the seam sealer...clean it all up ,epoxy it,and reseal it
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Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver |
07-10-2019, 02:53 PM | #9 |
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Join Date: Mar 2005
Location: Atlanta
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Re: How to handle - Floor surface rust
Any tips on how they get that awesome TIG welded look on the seam sealer?
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If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM. |
07-10-2019, 03:01 PM | #10 |
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Join Date: May 2015
Location: Alabama
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Re: How to handle - Floor surface rust
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Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver |
07-10-2019, 05:02 PM | #11 | |
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Join Date: Dec 2009
Location: TN.
Posts: 7,748
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Re: How to handle - Floor surface rust
Quote:
If you want the sealer to look like that, That video really helps. Here is my opinion. I was employed at an automotive plant for 18 years. I don't care to mention which one. Four of those years I was in the part of the plant that put the sealer on the cars. The reason it looked like that is the sealer gun was turned up high so that it would cover the seam fast. The floor seams was less critical for appearance (because they get covered up) than the door seams or seams that are visible. The seams that are visible get squeegeed smooth like in the video on the second seam (but with no air ) . (My Suggestion If you smooth Your sealer out it will get down in the seam better and be flat on top so it will be less likely to hold water in the future. Working in the sealer area I learned why there was sealer in area's that might not require sealer. Reason #1 : If your friend working down the assembly line put's there hand in the same spot on each car( to brace their-self) They will get messy Reason #2 : If you put a Big Pile of sealer where they sit in the car (to do there job) and they don't see it .
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07-11-2019, 07:02 PM | #12 |
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Join Date: Sep 2008
Location: Newport, North Carolina
Posts: 617
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Re: How to handle - Floor surface rust
My thinking is, the rust started in those seams under the sealer...clean that seam seal out, spray the seams with ospho so it will seep in the joint where you can’t clean out and then spray with epoxy...reapply the seam sealer.
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07-22-2019, 06:39 PM | #13 |
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Join Date: Aug 2015
Location: Sweden
Posts: 19
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Re: How to handle - Floor surface rust
For best results, sandblast after removing sealer. Muratic acid can remove rust.
Recover with epoxi primer, give it two coats and finish off with a layer of alkyde based bodysealer that will work as a sound deadener as well. |
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