Rust Converter

jimdog · Mar 2, 2016

Anyone had any experience with a product called OSPLO it's a rust converter?Its to be used on bare metal sanded or sand blasted.
Thanks;Jim

showcrop · Mar 2, 2016

Do you mean Ospho? If so it is very highly rated.

da.bees · Mar 2, 2016

Good stuff

FBH44 · Mar 4, 2016

Best results I have had with Ospho is to remove all the rust I could, with brushes, grinders, sandpaper, etc. and only then use the Ospho.

showcrop · Mar 4, 2016

(quoted from post at 03:49:53 03/04/16) Best results I have had with Ospho is to remove all the rust I could, with brushes, grinders, sandpaper, etc. and only then use the Ospho.

2X what fbh44 said. I have been using Rust Mort by SEM on a car project. The procedure that seems to work well is to clean all the rust and paint off, then apply the converter. You will almost instantly see black spots where you thought you had all the rust off. You can then clean those spots a little better, with whatever method you like, then apply your converter a second time to mostly newly exposed rust. Now comes the controversial part. You should then wash the part to remove any residue, but some people are sure that they will get a lot of flash rust after washing. I have never gotten a significant amount of flash rust, but if you are really concerned about it, you can always wipe it down with a solvent final prep type of product as it is drying, in order to prevent rust.

Duane WI · Mar 5, 2016

What I did on my project truck was to use a diluted solution of phosphoric acid as the wash step. Something in the area of 10% acid. I just used milk stone remover that you can buy at the farm supply store. It is around 35% to 40% phosphoric acid so 3 parts water to 1 part milk stone remover. Squirt bottle and lots of paper towels to wipe it dry. Use a scotch brite pad with the rinse solution to scrub off any tough acid residue. I would do this the day before painting. The day of painting scuff good with a scotch brite pad and then wipe is all down with wax and grease remover. Primed with Omni Epoxy. So far three years latter everything looks good. I had all of the rust off I could get by wire wheeling and sanding. Used the acid to get into the pitted areas. Using the diluted acid as a rinse made sure I didn't get any flash rust.

jimdog · Mar 5, 2016

Thanks Duane,I have used the deluted phosphoric acid method,but find you have to dry it immediately or it will flash rust.I found a air gun works good to quickly dry it.I was wondering if the product called OSPLO rust converter would work better in that it would not flash rust.I would agree the phosphoric method does remove the pitted rust,but it is the flash rust i'm having issues with.
Thanks for your reply.

Duane WI · Mar 5, 2016

I would use the full strength Ospho for the main rust removal. Just use the diluted stuff to rinse it off right before painting. I left the full strength stuff on until the day before painting and then used the diluted as the rinse. Dried it off with paper towels and let it sit overnight to make sure fully dry.

showcrop · Mar 5, 2016

(quoted from post at 10:37:23 03/05/16) Thanks Duane,I have used the deluted phosphoric acid method,but find you have to dry it immediately or it will flash rust.I found a air gun works good to quickly dry it.I was wondering if the product called OSPLO rust converter would work better in that it would not flash rust.I would agree the phosphoric method does remove the pitted rust,but it is the flash rust i'm having issues with.
Thanks for your reply.

I spray or flood the parts to remove excess acid, then take an old bath towel to dry in order to avoid the flash rust.

Rust Converter

jimdog

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showcrop

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da.bees

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FBH44

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showcrop

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Duane WI

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jimdog

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Duane WI

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showcrop

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