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Old 01-29-2013, 07:52 PM
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Preparing rust for paint

So I'm working on a horsetrailer..I know hardly a hot rod but I need some advice.I hit it with a wire brush&then sanded it down smooth with the D/A Im wondering if after I shoot primer&paint will that seal it or will it just eat through the paint?I'm open to suggestions.Thanks

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Old 01-29-2013, 08:21 PM
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Originally Posted by cutthroatkid View Post
So I'm working on a horsetrailer..I know hardly a hot rod but I need some advice.I hit it with a wire brush&then sanded it down smooth with the D/A Im wondering if after I shoot primer&paint will that seal it or will it just eat through the paint?I'm open to suggestions.Thanks
Horse trailers, The urine, and manure impregnate the metal in all the blind spots and inside the tubes Ive painted many! I haven't found much that will stop it! The good products have been changed (E.P.A.) A good acid wash and triple rinse Etching primer on all bear metal, seal with a top line epoxy and shoot with a good industrial machine enamel ( colors are limited) That will take abuse and stand up against the animal excrement! They don't piss on everything but in the heat it evaporates and condensates and impregnates cracks and crevices even over head! The Bison trailers are the worst to rust in my opinion!

Jester
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Old 01-29-2013, 08:24 PM
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So will the primer&paint start to peel immediately if I shoot it the way it is?
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Old 01-29-2013, 08:40 PM
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Sandblast it, you need clean, 'unadulterated' metal...

Duke
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Old 01-30-2013, 03:43 AM
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Sandblast it, you need clean, 'unadulterated' metal...

Duke
Media blasting is the only way to make it last, wire brushing polishes the rust and hides it. And urine is acidic so you need epoxy primer and a good urethane top coat to stand up to the acid. If you go quick and cheap then a cheap repair is all you will get.
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Old 01-30-2013, 01:55 PM
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Sand blasting is good! I still use etch, and lately epoxy sealer instead of the zink primers!
Auto paints dont stand up! An Industrial machine enamel paint used on laths and presses and mills, and industrial motors will! On sulfuric acid reactors The motors still look good after years of use with acid slashing on them every day! Zinc Chromate primer if you can obtain it !Zinc Chromate is a corrosion resistant agent that is added to certain coatings. Even today, chromate finishes including Zinc Chromate provide superior corrosion resistance. ( Zinc Chromate is highly toxic) it protects the surface from proliferation of organic matter, acids, salt,etc. Its in a lot of Machine finishes!

I take for grated this is a working trailer not a weekend horse show show piece! And your on a budget and want it to last a while but be able to take the abuse horses can dish out and working around your stables!

Jester
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Old 02-02-2013, 11:57 PM
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Any rusted panels must be sanded down to the max you can to where all rust is gone and not seen again.... Sand it with 80 grit or a wire wheel in tight spots... blow dust, dirt, residue off, clean it with some kind of metal cleaning agent, even though some people use thinner to make sure the metal is properly clean so the primer can adhere....Then use a expoxy primer because it has the most bite to the bare metal than any other bare metal treatment... give it some flash time between coats and u dont have to apply it heavy either, put it light to medium coats... 2 coats is fine, get it covered completely but make sure your gun is setup properly to where you have enough material coming out but not too much (this is done from adjusting the fluid nozzle in and out) then you have about a hour window to shoot your topcoating primer of choice... (primer filler, polyester, etc) you can actually spray color over the epoxy primer
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Old 02-06-2013, 07:28 PM
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All the above is good advice, but urine is a salt not an acid. Once you get the paint job done if you'll rinse it from time to time with a mild acidic detergent it will last much longer.
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Old 02-07-2013, 05:46 AM
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All the above is good advice, but urine is a salt not an acid. Once you get the paint job done if you'll rinse it from time to time with a mild acidic detergent it will last much longer.
My mistake, thank you for the correction.
Apparently the vegetarian diet has something to do with it.

Urine pH: Urine pH is typically acidic in dogs and cats and alkaline in horses and ruminants (cattle, deer, sheep, buffalo, ect).
Merck Veterinary Manual
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