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rust inhibitor

Old 07-20-2015, 06:28 AM
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Default rust inhibitor

Looking for a rust inhibitor that will stop existing rust in it's tracks but doesn't need a top coat. Would prefer to be able to spray it on for tough to reach places but not a necessaty. Looking to do undercarriages of my vehicles. I keep hearing POR 15 is about the best you can get. Anything else out there? Thx.
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Old 07-20-2015, 06:34 AM
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i used Eastwood Rust Encapsulation last fall. I'll have to take a look and see how it looks now.
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Old 07-20-2015, 06:38 AM
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I am pretty sure they all must be topcoated.

I used a product similar to por 15. Was sold at hardware store in pint containers which I used for a small job. Turns black and very hard. Used it on a heavily front end of an old rv and topcoated white. Three years later never rusted again and was painted white with rust oleum. The stuff really works well.

Unpainted it does not last and starts to rust fairly quickly, accelerated by moisture.

The website indicates top coating in their steps
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Old 07-20-2015, 07:55 AM
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used POR 15 on a few projects (one was a trailer) I would recommend it.
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Old 07-20-2015, 08:05 AM
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This worked well for me, and goes on clear. VHT


Amazon Amazon
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Old 07-20-2015, 08:41 AM
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Originally Posted by WPBTH View Post
used POR 15 on a few projects (one was a trailer) I would recommend it.
This is great stuff.
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Old 07-20-2015, 09:54 AM
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POR 15 on my dad's old boatlift (steel beams) and it prolonged the life for 6-7 more years. Never coated again and just replaced with aluminum this go 'round. Good stuff.
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Old 07-20-2015, 11:38 AM
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I used POR 15 on my trailer leaf springs and so far after 1 year of mostly salt water dunkings it has held up great. I like that it's preferred that the part be rusty when you're applying it (Paint Over Rust).
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Old 07-20-2015, 11:47 AM
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I believe Por 15 is sensitive to UV if not top coated. might want to check it out.
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Old 07-20-2015, 11:50 AM
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Benjamin Moore, Rust destroyer. I've used it several times works good.
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Old 07-20-2015, 12:33 PM
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Try fluid film it doesn't dry but it stops the rust. I have used por 15 , rust bullet and others they all peeled after a few years and the rust came with it. I used por 15 on the rusted oil pan on my 7.3 diesel truck and it peeled off after two years. Por 15 also peeled off the frame of my corvette. It stuck good to the rust but came off in large pieces with the rust stuck to it. I'm using fluid film for everything now. You can get it in a gallon kit with a spray gun.

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Old 07-20-2015, 12:54 PM
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Originally Posted by WaterEnjoyer View Post
I believe Por 15 is sensitive to UV if not top coated. might want to check it out.
This is true. General consensus is, no need to top coat a frame that is not in direct sunlight, but if you were doing a bumper or something along those lines then, you would have to.
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Old 07-20-2015, 04:51 PM
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I've had good luck with fluid film. On my truck, I spray the undercarriage with fluid film and inject it into the door seams as well. I spray it into hard to reach places in the body. I pump engine oil into the frame rails and rocker panels. My truck is 11 yrs old and I started doing what I just described about 7 yrs ago. It has stopped corrosion cold. At the same time, I started doing that to my corrolla that is now 21 yrs old. The corrolla looks like it's good for another 10 yrs.
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Old 07-20-2015, 05:00 PM
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POR 15 is a PITA to do right. And you have to top coat it. Trust me it will fail in sunlight if you do not. Done exactly as they recommend with all the pre conditioning it is decent.

I am also looking for a simpler product that is a bit more forgiving application wise also...

Good post....
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Old 07-21-2015, 09:57 AM
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Ok great suggestions but here are my concerns.
POR 15 sounds like the prep is gonna be more then I want to get into. Although I don't mind hitting some of the more accesable areas with a wire brush or scraper I'm not looking for a frame up restoration and top coat. I'd also like something sprayable. So that is sounding like a no-go.

Fluid Film seems to be the new rage but I wonder about longevity and will it attract dust and grime and/or get gummed up? Does it actually nuetralize rust? How is it different from say just spraying everything with WD40 or maybe CRC engine sealer?

Don't now anything about Benjamin Moore, VHT, or Eastwood, I'll have to look into those more.

Thx for the ideas people, keep em coming.
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Old 07-21-2015, 10:29 AM
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I have had good results with the eastwood, and the spray on bed liner its rough but stays on.
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Old 07-21-2015, 01:12 PM
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If you want an rattle can then just go get any rust converter. spray on then paint over
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Old 07-21-2015, 05:18 PM
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Originally Posted by KeithS View Post
Ok great suggestions but here are my concerns.
POR 15 sounds like the prep is gonna be more then I want to get into. Although I don't mind hitting some of the more accesable areas with a wire brush or scraper I'm not looking for a frame up restoration and top coat. I'd also like something sprayable. So that is sounding like a no-go.

Fluid Film seems to be the new rage but I wonder about longevity and will it attract dust and grime and/or get gummed up? Does it actually nuetralize rust? How is it different from say just spraying everything with WD40 or maybe CRC engine sealer?

Don't now anything about Benjamin Moore, VHT, or Eastwood, I'll have to look into those more.

Thx for the ideas people, keep em coming.
Had same concerns about fluid film. It does not turn rust into non rust if that's what you mean by "neutralizing", however it stops the rust from continuing and prevents any further rusting. It leaves a little bit of greasy residue on the bottom of a vehicle, but it's not messy and doesn't hold the dirt. I throw a lawn sprinkler under my vehicles a couple times a year to rinse them off underneath. My vehicles are very clean underneath, yet I've got a build up of fluid film that does not come off with the undercarriage rinse. It does not dry out. I apply fluid film once a year in the fall. I don't rack up alot of miles on my vehicles and I'm very analysis when it comes to maintenance. When I buy a vehicle, new or used, my goal is to get 20 yrs out of it. Got a corrolla that's 21, truck that's 11, and accord that's 8. Just have a spec of rust behind the rear wheels of the corrolla, but it still looks great topside and underneath. The truck, a nissan titan, has black (from the factory) frame rails with not a spec of rust on them. I do have one area of rust on the truck. That stupid storage compartment behind the driverside rear wheel rusted on the inside. I've never used it from day one, and apparently the gasket leaked allowing water to enter and I've never thought to open it and treat it with fluid film. So while it did rust, again, having never being treated with fluid film, the rest of the truck (top and bottom) is rust free.
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Old 07-21-2015, 06:11 PM
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Originally Posted by KeithS View Post
Ok great suggestions but here are my concerns.
POR 15 sounds like the prep is gonna be more then I want to get into. Although I don't mind hitting some of the more accesable areas with a wire brush or scraper I'm not looking for a frame up restoration and top coat. I'd also like something sprayable. So that is sounding like a no-go.

Fluid Film seems to be the new rage but I wonder about longevity and will it attract dust and grime and/or get gummed up? Does it actually nuetralize rust? How is it different from say just spraying everything with WD40 or maybe CRC engine sealer?

Don't now anything about Benjamin Moore, VHT, or Eastwood, I'll have to look into those more.

Thx for the ideas people, keep em coming.
I'm telling you that all I did was use rust converter, white and milky looking, over rust. The only thing I did for prep was spray on degreaser and pressure wash or wash with a hose. No wire brush sanding, etc and it worked fantastic. Turned black and hard like iron. BUT you do have to topcoat. Rubberized undercoating may even work but I prefer paint

I also used a cheap IR cup sprayer that I would wash out every five minutes as I applied in small batches. Washes with water so no big deal. Used the same sprayer to topcoat with rust oleum.
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Old 07-22-2015, 08:13 AM
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Pros up here us heated fluid film when warm that stuff goes in small areas
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