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01-03-2021, 10:40 PM | #1 |
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Best paint for painting over rust
While I have the body off replacing some rivets, I thought I'd also paint some areas underneath. Body is original and I don't want to blast or remove whats there. I just want to protect it from that horrible snow melting brine they put down in the tai-state area.
What's the go to product these days? I've used Por 15 in the past. |
01-03-2021, 10:53 PM | #2 |
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Re: Best paint for painting over rust
POR-15 is my paint of choice. It has worked out nicely for several of my cars that had rusted floor, etc.
gregg |
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01-03-2021, 11:24 PM | #3 |
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Re: Best paint for painting over rust
The POR-15 I painted the underside of my car with in 1988 is still holding up fine. That's because it's underneath, out of UV rays which will make it deteriorate quickly.
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01-04-2021, 12:02 AM | #4 |
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Re: Best paint for painting over rust
Paint directly over rust is not going to stop the progressive damage of rust, but will hide it from view like an ostrich hides his head in the sand. If the rust is not removed completely, you must convert it to iron oxide before painting. There are several excellent products to do just that, one of which being Rustmort. This is a watery clear liquid, best if applied by brush after removal of flaky rust. As it dries overnight, the rust will turn black, signaling readiness to receive paint without further preparation. It leaves no brush marks and is not a coating, but rather, is absorbed into the rust in a chemical reaction. Wear a full face mask and rubber gloves for safety, but in my case, I was sloppy and even then did not experience any issues from splashing it on my arms and neck.
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01-04-2021, 12:15 AM | #5 |
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Re: Best paint for painting over rust
The only way to protect a vehicle from the salt brine in winter is to not drive it. That salt spray gets in everywhere and will rust.
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01-04-2021, 12:19 AM | #6 |
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Re: Best paint for painting over rust
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Owner/Operator of 'Jailbar Ranch' on the side of Mt. Pickett. Current stable consists of 1946 1/2 ton pickup turned woodie wagon with FH V8, 1947 Tonner Pickup (red) mostly stock with exception of a cummins 6at turbo diesel, 1946 Tonner Pickup (green) with 226 cu in 6 cyl flathead, 1979 Toyota landcruiser wagon, completely encased in 1947 Ford Jailbar sheet metal. Ok, cornbinder rear fenders..... 'Rusty ol' floorboards, hot on their feet' (Alan Jackson) |
01-04-2021, 12:21 AM | #7 |
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Re: Best paint for painting over rust
We're on the same wave length!
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Owner/Operator of 'Jailbar Ranch' on the side of Mt. Pickett. Current stable consists of 1946 1/2 ton pickup turned woodie wagon with FH V8, 1947 Tonner Pickup (red) mostly stock with exception of a cummins 6at turbo diesel, 1946 Tonner Pickup (green) with 226 cu in 6 cyl flathead, 1979 Toyota landcruiser wagon, completely encased in 1947 Ford Jailbar sheet metal. Ok, cornbinder rear fenders..... 'Rusty ol' floorboards, hot on their feet' (Alan Jackson) |
01-04-2021, 01:01 AM | #8 |
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Re: Best paint for painting over rust
Rust Mort is a great way to convert Iron Oxide into black Iron phosphate which stops it. Then paint over it with whatever you want. Of course wire brush or scrape any loose rust off before the Rust Mort.
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01-04-2021, 02:06 AM | #9 | |
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Re: Best paint for painting over rust
Quote:
Rust Mort is an acidic compound that converts existing rust to an insoluble black coating prior to applying body filler, primer or top coat. Features
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01-04-2021, 02:51 AM | #10 |
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Re: Best paint for painting over rust
I use Ospho.. (osphoric acid). I get it at a marine supply place down at waterfront. It sounds similar to the product above....... Mark
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01-04-2021, 06:37 AM | #11 |
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Re: Best paint for painting over rust
Thanks, all. Yes, I have no intention of driving it during winter weather, but that crap sticks around for a long time. Even after a few rain showers you can see residue still on the street.
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01-04-2021, 10:18 AM | #12 |
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Re: Best paint for painting over rust
I have used SEM Rust Shield with the catalyst over the years, and it has stood up to many winters of driving a Jeep here in the Northeast. I have used it on the '40 frame, and trunk floor. I have also used their dual mix structural adhesive, and self etching primers SEM has excellent tech support, call Dave at 800 831 1122 and run your particular scenario by him for his perspective. SEM is in NC.
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01-04-2021, 10:29 AM | #13 |
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Re: Best paint for painting over rust
You are indeed correct, there is no total protection. The salts gies in places that your eyesight doesn’t and lays there and corrodes.
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01-04-2021, 11:02 AM | #14 |
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Re: Best paint for painting over rust
You don't need to buy expensive rip off rust treatments. The active ingredient is phosphoric acid. Just buy a gallon of the acid, dilute it yourself with water and you will do much better at less than half the cost. Always pour acid into water, not the other way around.
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01-04-2021, 11:36 AM | #15 | |
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Re: Best paint for painting over rust
Quote:
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01-04-2021, 12:00 PM | #16 |
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Re: Best paint for painting over rust
I have used Rust Shield from SEM and it's worked very well.
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01-04-2021, 07:02 PM | #17 |
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Re: Best paint for painting over rust
Phosphoric conversion is good. Etching primer has the acid in the primer to etch its way into the metal. Por-15 has an etch formula in it as well. When the surface coating breaks down at some point then the metal will again start to oxidize but a little prevention goes a long way toward longevity.
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01-04-2021, 07:11 PM | #18 |
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Re: Best paint for painting over rust
Paint over rust? WHAT?
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01-04-2021, 09:25 PM | #19 |
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Re: Best paint for painting over rust
I wondered if I was the only person thinking that.
Then again, if you start with this you just don't worry so much... This is a friend's car which is a lot of fun to run around the back roads. The chassis is much better condition than the body. |
01-04-2021, 10:19 PM | #20 |
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Re: Best paint for painting over rust
Let me be the first to agree it must be a lot of fun on the back roads. I tend to obsess about rust the way some people do about bondo. Of course a vehicle with some 1/2" bondo here and there can be a lot of fun too if you can't spring for a new brookville body. I skip the bondo for the most part, but don't come around the Mt Pickett complex with a magnet. For me, it's all about having some fun with old fords, making them run and drive and stop. Driving them some more and then maybe picking up some nice parts or even a new project. I have fairly low expectations, so I am seldom dissapointed.
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Owner/Operator of 'Jailbar Ranch' on the side of Mt. Pickett. Current stable consists of 1946 1/2 ton pickup turned woodie wagon with FH V8, 1947 Tonner Pickup (red) mostly stock with exception of a cummins 6at turbo diesel, 1946 Tonner Pickup (green) with 226 cu in 6 cyl flathead, 1979 Toyota landcruiser wagon, completely encased in 1947 Ford Jailbar sheet metal. Ok, cornbinder rear fenders..... 'Rusty ol' floorboards, hot on their feet' (Alan Jackson) |
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