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Old 10-04-2013, 04:21 PM
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Bad News Guys...

So I have some bad news, I discovered some cancer(rust) on the bottom of my passenger door I'm going to try and sand it out and hopefully it'll be okay.
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Old 10-04-2013, 04:41 PM
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Re: Bad News Guys...

make sure you sand all of it out, and seal it with something, such as bondo / primer / paint
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Old 10-04-2013, 04:58 PM
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Re: Bad News Guys...

Yea for sure. Ive never really done any body work before, but isn't there something you can spray on there and it stop the rust and turns it into usable material?
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Old 10-04-2013, 06:36 PM
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Re: Bad News Guys...

Tremclad rust paint maybe?
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Old 10-05-2013, 12:06 AM
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Re: Bad News Guys...

That ****s a hoax.... Only way to stop rust is to grind/sand/cut it out/off COMPLETELY. And then fill with plastic(bondo), weld in new metal, w.e works for you. Make sure to sand spot with automotive 180grit sandpaper, then feather out with 320grit, then feather with red scuff pad, prime with a good primer, make sure the plastic is smooth and straight first. Then wetsand primer with 600 grit, followed by 800grit. Then use a touch up paint of your cars color, found in door jam(code). And don't tape it if you plan on doing that one spot, just let the over spray go on the door as it wants, wipe overspray only with laquer thinner, not your fresh paint job..... Then spray clear, clean overspray if bumpy. If you are going to blend the door, remove all gaskets, moldings/ handles. Follow previous steps, but grey scuff the rest of the door before you paint. Spray color where you did the body work, and about 3 inches past that primer, you will get it by the time your there... Then clear the entire door, but lighter of a spray towards the outer parts of the door. That will blend the door and make it look like it wasn't painted. Unless the rest of the car looks like **** lol.

But practice on other metal, scraps, before your car. You can do this with spray paint, if you do I recommend automotivetouchup.com

Lmk if you need any further advice ill be glad to help
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Old 10-05-2013, 03:51 AM
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Re: Bad News Guys...

KILL IT BEFORE IT LAYS EGGS!!
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Old 10-05-2013, 09:43 AM
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Re: Bad News Guys...

ProjectPrelude95, Thanks for all the info! If it counts for anything it mainly on the inside of the door, right at the bottom, right as door panel stops. Ill try to get a picture up later.
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Old 10-05-2013, 12:45 PM
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Re: Bad News Guys...

The only stuff I have used to kill rust, and trust that it actually killed it was plain white vinegar. I've been using it on my suspension parts ('99...CANADIAN suspension parts), and it stripped them bare. The only catch is, you have to let it soak for a few days. The rust rinses off with vinegar, water, and a soft toothbrush, no lie. I'll be posting pics of it in my restoration thread.

The only reason I trust the vinegar method is because once its rinsed off, you're left with bare metal. These other spray on over-top of rust chemicals leave "reasonable doubt" in the back of my mind that they kill ALL the rust. Unless I see bare metal with my own eyes, I don't trust it.

Sand it, grind it, soak it, or cut it.
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Old 10-05-2013, 11:36 PM
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Re: Bad News Guys...

I have the same problem! )= gonna try some of your methods and see if it gets it out.
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Old 10-05-2013, 11:55 PM
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Re: Bad News Guys...

I have had good success with pur15. After sanding down to bear metal I coating with pur15 then primer.
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Old 10-06-2013, 08:29 AM
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Re: Bad News Guys...

Ive heard of the vinegar method but had always thought it was one of those viral internet deals that didnt even work. Given where the rust is, soaking it wouldnt be possible. Havent had the chance to really assess the severity of it, but from the looks of it, I'll be able to avoide cutting and welding.
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Old 10-06-2013, 08:36 AM
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Re: Bad News Guys...

Yea, but your sanding it to bare metal. Which means you sanded all the diseased rust metal out already.

Once you get it to bare metal, you can just prime it...

But at the spot your talking about, siktor, is iffy because there is a seam there. And the metal below the seam is most likely rusty. You are going to have to sand that spot too. That metal is pretty thin there. I mean hell if it bothers you that much you might have better luck just getting a used door in good condition(no rust) and swap. That's if you don't feel up to doing the job yourself now.... Because then there's more involved, you are going to have to **** with the seam. That's the biggest difference. It's not that hard if you know what your doing, but that's how it is with all of auto body...

Only problem is, if you think you know what your doing, but really don't, you can **** up a panel pretty bad.... Everything's fixable though
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Old 10-06-2013, 09:21 AM
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Re: Bad News Guys...

Yea you arent kidding that its an iffy spot, and not exactly the easiest place to work on haha. I saw the rust and was like noooooooo with the slow-mo deep dramatic voice. I'm off work tomorrow and tuesday so I'll have to realllllly look at it, take pictures, and get your guys' opinion.
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Old 10-07-2013, 07:42 PM
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Re: Bad News Guys...

the thing with rust is that you really never know what you are dealing with, until you open it up..... at least you are dealing with door shell rust, and not quarter panel, or unibody/frame rust... which wouldnt hurt to check either. once the rust gets to the frame, and starts rotting it, a shop is gonna charge you 6k plus to fix. to do it the correct way of course. quarter panel rust is not as bad as that obviously. but the door shell can easily be replaced with a rust free door shell for under $100 from the right seller.... fender rust is a pain because fenders for our cars are not cheap at all.... unless you buy used private seller.

but anyway, back to what i was saying. it could be a little rust spot the size of a dime, but when you start sanding at it, you will find it to be the size of a nickel, then a quarter, then a half dollar, then slowly moving towards the size of your hand, **** there can be a foot of diseased metal under the paint. it all depends on the layers of paint and clear that the rusty metal has to rot through.... the spot that pops up first is the cause, but it spreads under the paint. and from what you are saying it sounds like your door was either not properly seam sealed, or over time the seam sealer gave way for a little water to get in there and sit. causing the rust.

but who knows, you might get lucky. it might end up only being the size of a nickel under the paint... and hopefully just surface nice easy rust to deal with. but make sure you get the old seam sealer out, blow the **** out of the seam to remove any dampness, wipe with laquer thinner, and properly re seam seal the door seams to prevent the rust from forming again.

I CANNOT stress it enough though, you NEED to sand down to bare metal, and properly prime. sand, seam seal, paint, and clear coat it in order to keep that metal protected.

Good luck with your choice of which way to take, its alot easier work too if you just take the door off the car and set on a blanket over horses, or a workbench or something. you wont kill your back, or ass as much lol.
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Old 10-07-2013, 07:55 PM
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Re: Bad News Guys...

It's common for 5th gens to rust on the inside bottom of both doors.


It will return - water always sits at the bottom of the doors causing this.


I second using POR15 products.
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Old 10-07-2013, 07:59 PM
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Re: Bad News Guys...

^+1. When I started working on my wheel wells, I found a small spot. I sanded it, and peeled away more undercoating... sure enough, there was more. It went all the way along the seam.



In case anyone was wondering...and wanted to give it a try some time. I know it works on suspension parts. I can't comment on body panels. i
It may pit them.


Plain white vinegar:

1)Pour it into a container you won't be caring about.
2)Sumberge the parts in the vinegar.
3) Get on with your life for a week or so.

When you come back, this is what you will find:


Gross.

Use pliers or something to grab the parts out, unless you're feeling adventurous and want to stick your hand in that mess. It stains your skin, so wear gloves. It also stains anything else it comes in contact with, so don't wear anything you care about when working around this stuff.

Here's the cool part! Take the part you are working on, and brush it with a toothbrush, or even a wire brush if you like. I found an old toothbrush worked great. The rust will brush off. if there's any tricky bits, use the brush and a bit more vinegar to scrub it off. Then rinse with water.

This was after about a week of soaking in the vinegar:







^ that cost ~$4.00

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Old 10-07-2013, 08:45 PM
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Re: Bad News Guys...

if its common on 5th gens, then that means they are not greatly seam sealed at the bottom seam. where water would sit...... only way to ensure it doesnt come back, is seal it....... with seam sealer. after blowing it out dry.
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Old 10-08-2013, 04:13 PM
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Re: Bad News Guys...

Is the rust on the bottom of your doors on the inside or outside?

Mine was on the inside


All cars rust in this area due to the fact that when it rains or you wash your car this area stays wet (unless you dry it off with a towel).

I paid a bodyshop ~$250 to fix mine on both doors. Three years later it still looks good.
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Old 10-08-2013, 05:23 PM
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Re: Bad News Guys...

All cars do not rust at that spot.... I've seen tons of cars older than 5th gen preludes, never repainted or body work done, that have no rust whatsoever there..... Same as the quarter panels on other makes, that's why it's called the famous honda quarter rust
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Old 10-08-2013, 08:38 PM
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Re: Bad News Guys...

I agree with JGB. Sitting water is also another leading factor to the rusting issue.


Quote:
Originally Posted by ProjectPrelude95 View Post
All cars do not rust at that spot.... I've seen tons of cars older than 5th gen preludes, never repainted or body work done, that have no rust whatsoever there..... Same as the quarter panels on other makes, that's why it's called the famous honda quarter rust

I've seen many cars older than 5th gens with this issue. Not just Honda's either.


The weather stripping in the wheel wells is a leading cause of quarter rust. These collect salt, misc debris and moisture that eat away at the paint and metal. Also the design of the quarters/rears that allow this junk sit and not be easily washed out is also an issue... Bottom of the quarters is just a resting spot for everything your tires have flung around.

Constant cleaning and maintenance of the area will prevent rust on any car. Just so happens Honda's way of "preserving" the quarter lip from stone damage and whatever other reasons they may have had for the use of the stripping - turned out to be a major downfall.


Again, it's not specifically a Honda issue. Just more common due to negligence of owning a cheap/reliable vehicle.
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