Rust converter vs. Por-15: Can you use Por-15 over rust converter?

For robust corrosion and rust-resistant surface for a lifetime on any metal, Por-15 is the best thing you have. However, a rust converter doesn't get rid of the coating; rather turns it into another stable compound.

Por-15 is a permanent solution from the rust that removes the rusty compounds from the element. And until it comes in contact with any cracking element, the rust won’t come back.

Both these rust removing formulas require a couple of coatings on the applying surface to get rid of the rusty condition. Moreover, metal prep is necessary to apply Por-15.

We'll go through every detail regarding the rust converter and Por-15 here. So stay tuned.

Rust converter vs. Por-15

Rust converter

A rust converter is a water-based chemical solution that converts the rust into another chemical compound. It doesn’t work as a permanent solution on the rusted surface.

However, regular usage of a Water-based Rust Converter can prevent it from getting back on the surface again. It basically, creates a barrier layer over the corrosive surface to prevent it from rusting again.

Rust converter has two main active ingredients to get the job done.

  • Tannic acid or phosphoric acid
  • Organic polymer.

Now, the question is how do these two ingredients work on the rusted surface?

Before getting deep into the rusted surface, we need to know what actually rust is. Rust is a type of chemical reaction that happens when the moisture comes in contact with any metal part and gets inside it.

The chemical reaction creates iron oxide, which is commonly known as rust. And rust converter works against the moisture and prevents it to get inside the metal surface to ultimately prevent rusting.

How to rust converter works:

  • Tannic acid or phosphoric acid reacts with iron oxide.
  • Tannic acid transforms iron oxide to iron tannate.
  • Phosphoric acid transforms iron oxide to iron phosphate.
  • Both turn into the stable black-colored coating.
  • The organic polymer provides a protective primer layer.

That is how the two main ingredients make a chemical reaction with the rust or iron oxide and transform it into a stable coating that is not rusted anymore.

Moreover, the coating works as the primer layer on the surface if you are looking forward to applying any paint on it. Two coatings of the converter can fix it for a long time.

Rust converter use in bus

Why is Por-15 used?

Por-15 used

Why anyone on the earth would love to try Por-15 putting the rust converter aside? Well, that’s a pretty good question to be asked when you are looking for a permanent solution to the rust.

Now, what is Por-15 Rust Remover? It is actually a rust removal product that works on the rusty surface to remove it permanently and prevent rust. Unlike rust converter, there's less chance of getting the rust back here.

However, you should keep the following things in mind before applying them.

  • Remove rust converter coat before applying.
  • Coming in contact with elements can bring back the rust.
  • Two coats of the Por-15 are enough.
  • Necessary to have metal prep before applying.

In other products, it’s quite natural that moisture will attack the coating and come in contact with the metal surface. Subsequently, the corrosion on the surface will slowly, but come back for sure.

According to our research sessions, it has been proved that the preventive coating deals with moisture to its advantage. Therefore, it is fair enough to call it a permanent repair material.

Except for the Por-15 Rust Preventing Coating, you need three more products to get the job done perfectly. These are –

  • Por-15 cleaner and degreaser
  • Por-15 metal prep
  • Por-15 topcoat.

We'll get into the details about how to apply these coated on rusted surfaces in one of the later sections of the article.

Comparison between rust converter and Por-15

The confusion between choosing a rust converter and Por-15 is quite common when it comes to the question of removing the rust from any metal surface.

However, you might have already known that the first one is a temporary rust removal coating. And the second one is a permanent rust removal coating until it comes in contact with elements like UV-ray.

Go through the comparison chart before moving further on.

Rust converter


A temporary rust removal coating

A permanent rust removal coating

Requires two for four coatings

Requires only two coatings

No topcoat is required

One top coat is required

UV-ray isn’t much affective

Can break because of the UV-ray

Contains phosphoric acid and organic polymer

Contains zinc phosphate and phosphoric acid

Takes more than a day

Doesn’t take more than a day

Several products can be used

Por-15 products are recommended

Although it seems that both these rust removal options have a lot of differences. However, the preparation before applying both these coatings is pretty similar.

You have to remove loose rust from the metal surface before applying the converter. Again, cleaning and metal prepping the surface before applying the rust preventive coat are necessary for the second option.

Is it okay to use Por-15 over the rust converter?

Por-15 Rust Remover

Nope, it isn’t okay to use Por-15 over rust converter according to the experts. And we have not found any satisfactory result in our research as well by trying to use Por-15 over rust converter.

A few reasons are there that can prevent the rust preventive product from setting up on the metal surface.

  • Rust converter is a water-based product.
  • It creates an extra layer of coating on the metal.
  • Por-15 is applicable on rusty surfaces.
  • A bare metallic surface is also okay.
  • The extra layer of the converter will prevent sealing the metal.

The main thing is that because of the extra coated layer, Por-15 can't seal the metal with its coating. Without proper sealant, it's impossible to prevent rust.

Therefore, using it over any rust converter is just a waste of time.

How to use rust converter?

Rust converter basically converts the iron oxide into a stable chemical reaction and removes the rust. However, you need to know that it is only a temporary way to remove rust from the metal surface, not a permanent one.

However, you need to prepare well including the pre-cautions and apply the coating accordingly to get the intended result out of it.

Two things you can do as precautions, which are –

  • Wear safety glasses.
  • Wear safety hand gloves.

When you are safe enough with your preparations, you can move on to the work that begins with the cleaning of the metal surface.

  • Use a brush to clean the applying surface.
  • It will remove the loose rust from the surface.
  • Wipe on the surface thoroughly once.

After removing the extra rust that was loose and any other contaminants from the surface, you can apply the coat. However, you can either go for a paintbrush or sprayer for this.

  • Take an extra container.
  • Pour some of the coat into the container.
  • Apply the coating on the surface slowly using the brush.
  • Let it dry for up to one hour.
  • After one hour, it will get ready for the second coat.
  • Apply the second coat in the same manner.
  • Let the second coat dry for 48 hours.
  • Then, you can put on any oil-based paint on it.

However, you need to know that two coats are enough when you are applying the converter using a paintbrush. Meanwhile, three or four coats are necessary while using a sprayer.

How to apply Por-15 on any object?

For a long-lasting solution from rust on iron, steel, or any metal products, Por-15 offers the most effective service. However, to get the most out of it, the coating requires metal prep before topcoat after coating.

Applying the rust removal product isn't a tough task unless you know the right way to do this and work accordingly. We've categorized the entire coating process into three sections.

  • Cleaning the surface.
  • Metal prepping.
  • Applying the coat.
  • Applying the topcoat.

Cleaning the surface: A Por-15 cleaner and degreaser is necessary to clean the surface properly before you begin the metal prep. Here are the steps to follow.

Using cleaner and degreaser means removing any kind of contaminants on the applicable surface, which can affect the rust preventive coating and not provide the intended result.

  • Wear safety gloves and glasses as pre-cautions.
  • Apply the cleaner or degreaser on the surface.
  • It's better to do it with a sprayer.
  • Let it dry for a few minutes.
  • Wash the surface with clean water.

Metal prepping: Metal prep is necessary to create the perfect surface to apply the coating and let it stay here forever. It has zinc phosphate and phosphoric acid that chemically reacts with the metal surface.

If somehow the applicable surface stays shiny or unsuitable for applying the rust preventive coat, the project might fail. It drops the zinc phosphate coating and etches the surface ready for applying the coat.

Here’re the steps to follow.

  • Apply the metal prep using a sprayer.
  • Continuously spray on the surface for up to 15 minutes.
  • Don’t let the prep dry on the surface.
  • It will create a zinc phosphate coating.
  • Wash it with clean water.

However, before applying any metal prep it’s necessary to keep in mind that it doesn’t have any harmful objects that can damage the surface.

Applying Por-15 coating: Here comes the big part of the project where you’ll be applying the rust preventive coating on the metal prepped surface.

Basically, you need to have a couple of coats on the metal surface before applying the topcoat. However, applying this coating is a lengthier process as well as you have to wait until the first coat dries before applying the second coat.

Here’re the simples steps you can follow.

  • Pour some of the coatings into a container.
  • Use a roller brush or paintbrush.
  • Put on the first coating slowly using the brush.
  • Let it two to three hours to dry.
  • Now, pour more coating into the container.
  • Apply the second coat in the same way.
  • It can take up to six hours to get properly dry.

Apply the topcoat: The last but not the least stage of applying Por-15 coating is applying the topcoat. Although it's a rust preventive coating, it can still break down due to elements like UV-ray.

And that's when you need a topcoat over the two layers of coating to make it permanent and prevent the breaking of the anti-rust layer.

Which one should you go for: Rust converter or Por-15?

The answer is quite simple because it depends on what you want or what the metal requires. As for a permanent coating and prevention from rust, Por-15 is always suggested.

On the contrary, a rust converter can transform the iron oxide into a stable substance that basically removes the rust. However, you don’t have to worry about the breaking of the sealant because of the UV-ray.

Is it beneficial to use a Rust converter?

Rust converter is a water-based product that removes rust by creating a stable chemical reaction on the metal surface. Here are some of the benefits, you might enjoy from it.

  • It is easy to apply.
  • Three different ways of applying the coat.
  • No need to apply the extra coating.
  • Metal prep is not required.
  • Not affected with the UV-ray.

Is it worth putting Por-15 on rust?

Of course, a long-lasting and permanent solution from rust is loved by everyone. And that’s what makes Por-15 better than other rust removals.

  • Ensures a permanent sealant from rust.
  • Only two coats are required.
  • Takes not more than 24 hours.
  • Top-coating stabilizes the sealant.

Final verdict

Both the formulas discussed above to remove rust apply to rusted metals. But when it comes to a long-lasting result, Por-15 appears as the winner.

Also, it only requires two coatings of the rust preventive product, whereas the converter may require up to four coatings. Moreover, you can get the result in a shorter time as well compared to the converter.

Now, the final decision is yours.

Last Updated on June 17, 2022 by sajjad

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