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Rust prevention for troughs

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BU1 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote BU1 Quote  Post ReplyReply Direct Link To This Post Topic: Rust prevention for troughs
    Posted: Nov/27/2020 at 10:13am
AMX #2 is due back from the blaster soon. What are you using inside the troughs? Is POR 15 still the go to product? Looking for some options. A brushable product would be nice, as I will have to apply with a brush under the gussets at the back of the trough on a 68.  Thank you.
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1968 AMX Rally Green 343 4spd since 1975
1968 AMX Rally Green 290 4spd since 2019
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Post Options Post Options   Thanks (0) Thanks(0)   Quote hassyfoto Quote  Post ReplyReply Direct Link To This Post Posted: Nov/30/2020 at 4:34am
Like most things on the car, what is the projected use and will the car sit out in the weather. The factory did not always add underlayment's (primer, sealant, e-coat) and/or paint. Combine thinly painted to no paint on sheet metal and several decades of exposure and lots of rust. 
With that said,
Correctly cleaning, primer and paint will perform the functions that you are looking for. By that I mean the car will most likely be garaged kept, will not be driven in bad weather and well maintained. Since the complete vehicle will need paint, this is an easy option. As far as rust prevention materials, they have their pros & cons. I would suggest a little research on the topic before you use these products vs paint. Yes, I use these certain projects and other times I prefer to repair, primer and paint the sheet metal. If its a cavity, like a rocker panel, i will add additional products such as rust prevention after paint.

You also asked if POR 15 is a good product. It is a good product amongst many for it's intended use. But it's use has limitations and certain warranties. I still suggest to everyone to carefully read the product description(s), intended uses, and warranties.

Finally, my answer is, the easy method is not always the best. Rust converters, rust sealers, rust preventers, etc.. may be great for a short term repair, but not necessarily the best option(s) for a full restoration and a vehicle you plan to keep for a long period of time.
Murphy's Law:
Any given mechanical job you decide to solve alone will imminently require a third hand, at its most critical moment

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Post Options Post Options   Thanks (1) Thanks(1)   Quote Steve_P Quote  Post ReplyReply Direct Link To This Post Posted: Nov/30/2020 at 8:07am
Since you are having it blasted, I would epoxy prime it and add some sort of topcoat. It doesn't have to be expensive, a few coats of acrylic enamel would be fine.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote turbo Quote  Post ReplyReply Direct Link To This Post Posted: Nov/30/2020 at 8:11am
POR 15 is great but must not be applied over a smooth, non rusty surface.
they call me Capt RETIRED!
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Post Options Post Options   Thanks (2) Thanks(2)   Quote JGRANTAMX Quote  Post ReplyReply Direct Link To This Post Posted: Nov/30/2020 at 8:53am
 I used POR-15 20 years ago it was properly applied to clean media blasted steel I still own the vehicle that's been parked in a dry garage all theses years never driven in the rain and rust is showing through, the stuff is garbage I wouldn't use it for free. To think rust can be covered over and it's gone is wishful thinking, there is no substitute for doing the job right if you want it to last, media blast, self etching primer or epoxy primer then urethane primer and a color top coat. I know several others that had the same results and a professional body man that won't use it. The only time POR-15 works is when you are sending it down the road.

J
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Post Options Post Options   Thanks (0) Thanks(0)   Quote BU1 Quote  Post ReplyReply Direct Link To This Post Posted: Nov/30/2020 at 9:20am
Thanks to everyone for the replies. The hard part is what to use to get coverage under the gussets? Are there brushable primers?
AMO #2726
1968 AMX Rally Green 343 4spd since 1975
1968 AMX Rally Green 290 4spd since 2019
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Trader Quote  Post ReplyReply Direct Link To This Post Posted: Nov/30/2020 at 9:42am
If this is a driver and not a show car, you can apply a rocker seam oil or similar product that will creep into the area and displace moisture to prevent rust. I use a high tack rust preventative chainsaw oil, as it's a lot cheaper. If you use it in you doors, it will actually creep out around and up the outside of the door. Great stuff to get into places you cannot, but then you have to clean off the excess that tries to get into and around visible panels before it collects a lot of road dirt.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 71SC360 Quote  Post ReplyReply Direct Link To This Post Posted: Nov/30/2020 at 10:11am
Originally posted by JGRANTAMX JGRANTAMX wrote:

 I used POR-15 20 years ago it was properly applied to clean media blasted steel I still own the vehicle that's been parked in a dry garage all theses years never driven in the rain and rust is showing through, the stuff is garbage I wouldn't use it for free. To think rust can be covered over and it's gone is wishful thinking, there is no substitute for doing the job right if you want it to last, media blast, self etching primer or epoxy primer then urethane primer and a color top coat. I know several others that had the same results and a professional body man that won't use it. The only time POR-15 works is when you are sending it down the road.

J


I second that!

We were POR-15 dealers at one time. After selling quite a bit of it, we did some of our own testing (quite a few different projects) we were not impressed with anything about the product and quit selling it. Needless to say, I will not ever use it an any of my projects.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote turbo Quote  Post ReplyReply Direct Link To This Post Posted: Nov/30/2020 at 11:17am
You are not supposed to put it on clean steel!  
they call me Capt RETIRED!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mbwicz Quote  Post ReplyReply Direct Link To This Post Posted: Nov/30/2020 at 11:18am
Nothing says that you can't take a self etching primer and brush it into the places that you cant get to with a gun. Just work it into the seams and corners to ensure that you get complete coverage. Do that area first, then spray the surrounding metal that you can get to.

She has survived almost 50 years, I'm sure that it will have better conditions for the next 50!
1970 AMX. Holy Crap its easy to spend money on this car!
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