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Have you used Dupont Metal Conditioner 5717S -phosphoric acid

Have you used Dupont Metal Conditioner 5717S -phosphoric acid.

I'm looking at a previous repair on my '69. It looks like surface rust at the rear floor pan-firewall, junction. My automotive industrial paint supplier recommends it as best for my application.

Thank you.

Regards,
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Old 12-03-2005, 12:10 PM
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Thumbs up acid

It works fairly well. sandblast is way better though, but also messy. Usually with phosphoric acid products like "ospho" or Navel jelly, you need to let them dry over night and the wire brush off the white residue dust that forms. It is best if you can brush or scrape the rust first to get it as clean as possible before application of the acid. Large flakes or pits need to be chipped out first too. The acid just cleans up light surface rust.
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Old 12-03-2005, 12:20 PM
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I used to be a dupont rep and I say don't use it for that application. It is used as a final cleaner and acid etch before priming, mainly in an industrial setting. It must be mixed 1 to 1 with water, kept wet on the surface for 5 minutes then flushed with plenty of water to remove the acid. It is not a rust remover!
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Old 12-03-2005, 05:58 PM
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The technique he gave varies a little-sqwirt on immediately will bring out a whiteish look-wipe immediately.

Ospho was on the shelf, and I knew that was not rust remover, but on guy said this is what they uded up north.

I guess sandblasting is the way. When is metal etching best.
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Old 12-03-2005, 06:24 PM
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There are small sandblasters that recycle the sand back into a bag for spot blasting. They can be used with a small homeowners type compressor. Mine was made by Matco tools. they are good for small jobs and don't make a mess.http://www.jcwhitney.com/autoparts/Product/tf-Browse/s-10101/Pr-p_Product.CATENTRY_ID:2007606/showCustom-0/p-2007606/N-111+10201+600002082/c-10101
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Old 12-03-2005, 07:19 PM
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forget the dupont stuff, it was designed to acid etch clean metal and get it ready for priming.

get some of this http://www.picklex20.com/ its one of the easiest metal conditioner/rust converter to use.

as with any metal conditioner, you can not use an etch primer with them. use an epoxy primer only if you plan on using a metal conditioner/rust converter.
Old 12-04-2005, 06:05 AM
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I've not used the Dupont product. But there are a handfull of rust converter / rust encapsulant type products on the market.

The ones that are a paint prep seem all to used phosphoric acid in combo with other ingredients.

One such product I have used with good success is SEM Rust Mort
http://www.sem.ws/catalog.php

The other type are the coatings that seem to generally be epoxy primers. These include POR15 and others (including the SEM Rust seal on my link above). These also work very well.

I like to use both products in combination.
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Old 12-04-2005, 08:25 AM
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I'll second picklex 20. It works great. Just mist it on bare metal and give it a quick rub with a scotch brite pad. As long as you don't don't expose the treated metal to water, it will stay rust free. Holds up to humidity well.

Right before you prime, go over the surface again with a scotchbrite and use a wax and grease remover to do a final cleaning.
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Old 12-04-2005, 08:37 AM
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I have received my bottle of picklex20. You sure you arent a rep? Well I'm looking for results next.
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Old 12-17-2005, 11:38 AM
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No rep here. Did my 53 MG TD panels during restoration. Here's a pic during body mach up.



Here's the finished car:

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Old 12-19-2005, 05:22 AM
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Have you looked at the POR products?
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Old 12-19-2005, 05:36 AM
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PBH: Not yet? What is it best used for?

Regards,
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Old 12-22-2005, 06:17 PM
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Fuelie600: I worked on the body of a similar type mg (a replica [metal]) when I was early teens.

Good memories. I know it is a fun car!

Regards,
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Old 12-22-2005, 06:19 PM
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Quote:
Originally posted by BReyes
PBH: Not yet? What is it best used for?

Regards,
www.por15.com

I find their products excellent, when used as directed. No short cuts.
Old 12-23-2005, 04:16 AM
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I was at autobody supply store today and read the POR15 brochure.
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Old 12-23-2005, 01:12 PM
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Old 12-23-2005, 01:12 PM
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