Our tech team answers a lot of technical calls and emails each day, and there are a lot of common questions asked and advice given. Many of them are about when and where to use our different coatings and paints. Rust products might be the most confusing as far as when to use them and which one is correct for your rust situation. Obviously, you want the best way to remove rust from your barn find. But using the wrong product at the wrong time can increase the risk of not effectively treating the existing rust or creating new rust down the road.
We offer both rust encapsulator and rust converter for DIY automotive restorations. The question isn’t whether rust converters and encapsulators work. Both are very effective at preventing rust through the task they are designed for. The question is when to use rust encapsulator or rust converter to treat corrosion. They are two different products with different uses depending on the rust that is present. I decided to put together this quick Rust Treatment Buyer’s Guide to help you decide when you should use rust encapsulator versus rust converter.
Rust Encapsulator
Rust encapsulator is one of the oldest and most well-known products we sell. We’ve been an innovator in rust treatments, and this “paint over rust” product has stood the test of time. It seals rust in and stops it from spreading while acting as either a primer or base coat. Since the encapsulator has UV resistance, you can even leave it without a topcoat on chassis parts and wheel wells. In addition to the original formula, we also offer Rust Encapsulator Plus and Platinum for particularly tough corrosion fighting and longer-lasting protection.
Encapsulator is probably the safest and most universal of our rust products as it doesn’t much matter what it is applied over — it can even be applied to partially rusted surfaces. Below are some examples of situations where rust encapsulator is ideal and where another product may be better.
1.Surface Rust— Encapsulator will easily go over areas of surface rust and stop the rust from spreading. One medium coat usually covers light surface rust.
2. Medium Rust — This is rust that is more than just surface or flash rust. It may have started to lightly pit the metal but hasn’t started to affect the rigidity of the metal. Start by wire wheeling or mechanically removing any loose rust and apply two or three medium coats of encapsulator to get complete penetration into the rust.
3. Bare Metal — Rust encapsulator can be used over bare metal, but I wouldn’t suggest it over epoxy or etch primer if you only have bare metal to deal with. It can be used to quickly seal bare metal in a pinch to avoid flash rusting as well.
- Mixed Surfaces — Rust encapsulator is the best rust product to apply over surfaces that might vary in grades of rust or have a combination of bare metal and old paint present. If you have an area that you cleaned to bare metal or repaired and there’s still rust around that area, I’d suggest rust encapsulator.
Poor Uses for Rust Encapsulator
While rust encapsulator can be applied to almost any surface, it isn’t always the best option. Below are instances where we’d suggest a different product for the best results.
- Over Rubberized Undercoatings or Heavy-Duty Anti-Rust — Undercoating and Anti-Rust are great products for undercarriage or hidden areas on a vehicle, but using rust encapsulator over them is unnecessary and isn’t using the product to its full potential. I absolutely prefer to use it as a base under rubberized undercoating for peace of mind.
- In Hidden, Boxed or Hard-to-Reach Areas — Rust encapsulator needs some basic prep before application (wire brush loose rust and degrease with PRE Painting Prep). It also needs complete coverage to properly stop the rust, and it can be tough to get it to cover properly on an area that hasn’t been prepared completely. For hidden, boxed and hard-to-reach areas, we suggest our Internal Frame Coating.
Rust Converter
Rust converter is a coating that will convert heavily rusted areas into a protective polymeric coating with little prep. The resulting black surface is also fully paintable as a primer so you can directly apply paint and sealant without sanding or further prep. It is compatible with most top coats we sell and is popularly paired with Eastwood Chassis Black.
This product works well when used as directed. However, unlike encapsulator, it doesn’t have room for error when it comes to using it on incorrect surfaces. There has to be 100% rust present for rust converter to work correctly and to fully cure. The surface also needs to be top coated after it is cured. For the best protection, we suggest applying rust encapsulator over the converter and then applying the top coat.
When Does Rust Converter Work?
- Medium Rust — Areas that are completely covered in substantial rust are okay to use rust converter on as long as it isn’t mixed with bare metal or other coatings around it.
- Heavy, Flaky Rust — Rust converter works best on rust that is heavy. This would be scaly rust that has begun pitting the surface and has covered all of the metal, such as in the image above. We still suggest knocking off the loose, flaking rust using a wire brush or wheel before applying the product. The goal is for the entire surface that is rusted to turn a purplish-black once the converter has finished curing. It may take two to four coats to fully convert a surface.
Poor Uses for Rust Converter
1. Bare Metal — Do rust converters work on bare metal? That’s a big fat no. This product needs 100% rust present for it to work. In fact, virgin, clean metal could actually flash-rust if rust converter is applied and left on it.
2. Mixed Surfaces — Again, rust converter needs 100% rust present for it to fully cure. This means it won’t work completely on areas that are a mix of rust and bare metal or a mix of original paint and rust. If you’re trying to treat small rust spots that have paint surrounding them (that we assume you don’t want to damage), you can use Fast Etch rust remover to saturate the area and get into those small rust spots. Then touch up with paint as needed.
3. Painted or Coated Surfaces — This product won’t work on bare metal areas to protect or prevent them from rusting. If applied to areas that are painted or used to coat for prevention, the rust converter won’t fully cure and the surface will stay sticky.
If you follow these quick guidelines, you can quickly determine if you need rust encapsulator or rust converter. Both can be purchased in our online Rust Solutions store, a brick-and-mortar Eastwood store or through our catalog. Each rust coating is available in sizes ranging from small aerosol cans to one-gallon cans and jugs depending on the severity of your project.
Feel free to drop us a comment if you’d like to see a Buyer’s Guide for any other product. Our other guides, along with demonstration videos, project walkthroughs and more, are available via the 24/7 Eastwood Garage home page. Eastwood has been a DIY automotive leader since 1978 and is committed to helping enthusiasts Do the Job Right.
FAQs
Removing all traces of rust really is the closest to a permanent solution. A phosphoric acid based rust converter kills and prevents rust from reforming, but its not the complete solution. Application of rust proofing is necessary too.
When would you use a rust converter? ›
Rust Converter is suitable for use on an rusty iron or steel objects. This includes wrought, cast iron such as railings, vehicles, trailers, farming equiment, gates and gardening equipment. Rust converter is not suitable for treating aluminum, copper, stainless steel or galvanized metal.
When should you not use a rust converter? ›
Apply product when the temperature is between 50 and 100 degrees F. It's best to avoid applying Rust Converter in direct sunlight or under very damp conditions. Do not apply if the surface temperature is below 50 degrees F. Can I use leftover Rust Converter after I've poured it out of the bottle?
What is the difference between rust converter and Rust Reformer? ›
Rust-Oleum Rusty Metal Primer is a good rust converter for metals that are heavily rusted but not yet falling into pieces. The Rust Reformer product is better when the rusted object is almost beyond saving. Both convert rust to a more solid surface, allowing for a paint to be applied.
Can you paint straight over rust converter? ›
A: No. Rust Converter should only be applied to the rusted areas, not the whole surface. After the Rust Converter has completely dry, it is recommended to wipe the surface with a damp cloth to remove all excess Rust Converter before you apply the oil-based paint.
Can you paint over rust encapsulator? ›
Once dry can Rubberized Rust Encapsulator be painted and with what? – This product remains flexible, therefore it is not recommended to paint over it.
What happens if rust converter gets on paint? ›
Rust converters produce a chemical reaction that reacts with the rust to produce a black inert substance that can then be over painted. The black coating will help prevent air oxidising the surface of the metal further preventing new corrosion.
Does rust converter actually work? ›
Rust converters are an excellent solution that transforms rust into something that seems paintable again. They can also make the rusted surface a sand-able material, and as such, rust converters can work as rust remover and preventers.
Can you use Eastwood Rust Encapsulator over paint? ›
Rust Encapsulator Platinum can be used as a top coat or can be top coated with almost any paint. It can be applied over bare metal or surface rusted areas.
Can you use rust converter on bare metal? ›
The protective barrier acts as a primer, allowing the metal to be painted over again. Rust converter is usually used on metal materials such as aluminium, iron or steel that can't be stripped fully back to bare metal.
Rust Encapsulator is the easiest way to stop and prevent rust and corrosion from spreading. Simply wire brush any loose rust, wipe with PRE painting prep to clean the surface and apply. Eastwood Rust Encapsulator has proven to be superior in UV resistance, preventing rust creep, and overall durability.
What is the best rust converter on the market? ›
Corroseal is widely regarded as the best rust converter paint and metal primer available today. Corroseal is easy to apply with a one-step process of using a paintbrush or a roller.
Will painting over rust stop it? ›
Painting over rust can stop the rust from spreading, but there are some things to consider. It's important to think about the extent of the rust and how or if the paint will hold. Scraping off surface-level rust and using a primer can also prevent issues. Painting over rust is a great way to stop it.
How do you remove extreme rust? ›
6 Easy Ways to Remove Rust from Tools & Hardware | The Home Depot
What is the best chemical for removing rust? ›
The most commonly used rust removing chemical is phosphoric acid. The solution creates a chemical reaction when applied to rust converting it to a water-soluble compound that can be scrubbed away quickly and easily.
What liquid eats rust? ›
Hydrochloric acid (which is also called muriatic acid in its diluted form), as well as phosphoric acid and sulfuric acid may be used in rust removal formulas using strong acids. These are mineral acids, and they are highly corrosive, especially in concentrated forms.
How does rust encapsulator work? ›
Best Rust Encapsulator Uses
It seals rust in and stops it from spreading while acting as either a primer or base coat. Encapsulator is probably the safest and most universal of our rust products as it doesn't much matter what it is applied over – it can even be applied to partially rusted surfaces.
How long does it take rust converter to dry? ›
The rust converter will dry in 20 minutes however it takes 24 hours to cure. Application of a second coating will ensure proper rust conversion. If applying an oil-based top coat, wait 48 hours after the last coat to ensure it has proper time to cure. Always read the safety precautions provided on the bottle.
What stops rust from spreading? ›
Store Properly: Store metal parts or products in a low-moisture area, or inside a temperature and humidity-controlled environment to significantly slow down rust. Use of desiccant drying agents in this storage are also helpful. Galvanize: Galvanizing coats iron or steel in zinc to protect from rust.
How do you prepare for a Rust Encapsulator? ›
Rust Encapsulator Platinum - Eastwood - YouTube
Do not apply Polyester Spray Putty or polyester Body Filler over Rust Converter & Primer/Sealer. Coverage: 5-10 square metres per litre depending on surface condition and film thickness.
How do you use an encapsulator? ›
A Guide to Eastwood Rust Encapsulator - Which One is Right ...
Can you paint over rust without sanding? ›
Yes, you can spray paint over rust. Before you paint, take the time to prepare your surface properly. Spray paint surface preparation preparation is extremely important and is the best predictor of how long your new paint finish will last.
Can you wax oil over rust? ›
waxoil doesnt kill rust. waxoil is a protective coating, which is used to prevent panels from rusting in the future.
Does Rust Reformer stop rust? ›
Rust-Oleum® Stops Rust® Rust Reformer® instantly bonds with rust and transforms it to a non-rusting, flat-black paintable surface as well as preventing future rust. It saves you the effort of sanding rust all the way down to bare metal. Rust Reformer is odorless, water soluble, completely safe and easy to apply.
What is the best paint to prevent rust? ›
Rust-Oleum® Stops Rust® spray paint and brush-on paint deliver tough protection that defends outdoor objects against the elements. Use it on garden benches, patio tables, chairs and more to update color and help prevent rust and corrosion.
How do you make a homemade rust converter? ›
Simply put cream of tartar in a bowl with equal parts baking soda, then incorporate a little hydrogen peroxide at a time until you achieve a paste-like consistency. Rub this mixture over the rusty object, let it sit for an hour, then wash it in the sink. Voilà!
What product turns rust into metal? ›
Through an innovative chemical conversion process, Corroseal Rust Converter converts rust (iron oxide) into a stable substance, magnetite. It also primes the surface with a high quality latex metal primer at the same time.
How long does Eastwood Rust Encapsulator take to dry? ›
Single coats of Eastwood Rust Encapsulator™ will be dry to the touch in 20 minutes and thoroughly dry in 3-4 hours at 68 degrees F. If a second coat is desired for greater durability, allow 1 hour before applying the second coat. If applying heavy coats, allow extra drying time before applying.
Can I use cold gal over rust converter? ›
Apply direct to the bare metal. Do not apply over rust converter or any other coating. Apply 2-4 coats to achieve minimum dry film builds of 75 micrometres when used as a sole coating and 25 micrometres when a topcoat is to be applied. Generally top-coating is not required.
How to Remove and Treat Rust DIY from Eastwood - YouTube
Can you use Rust Reformer as a primer? ›
A: While Rust Reformer is designed to turn rust black and make the metal paintable, it is not designed as a primer. Use the Rust Reformer, which contains oxalic acid, to spot paint over rust spots, then prime the whole door with an oil-based exterior primer and finish with an oil-based house paint.
How do you treat rusted metal before painting? ›
All it takes is a pass with a soft cloth dampened with a homemade degreasing solution—four teaspoons liquid dish soap mixed in one gallon of warm water—followed by a “rinse” using a water-dampened rag. Let the metal air-dry completely before breaking out the primer.
How do you remove surface rust from axle? ›
Scotch brite and wd40 has been my go to. Kroil Oil + Steel wool. It's one of the better non-corrosive rust remover out there. It's great for surface rust.
Does rust converter actually stop rust? ›
Rust converters produce a chemical reaction that reacts with the rust to produce a black inert substance that can then be over painted. The black coating will help prevent air oxidising the surface of the metal further preventing new corrosion.
How long does rust inhibitor last? ›
It has a long-lasting formula to protect metal parts by blocking rust and corrosion for up to 1 year outdoors or 2 years indoors. A must have for corrosion protection. *Test Lab: Petro-Lubricant Laboratories Inc.
How long does rust Check rust converter take to dry? ›
Product Application
The rust converter will dry in 20 minutes however it takes 24 hours to cure. Application of a second coating will ensure proper rust conversion. If applying an oil-based top coat, wait 48 hours after the last coat to ensure it has proper time to cure.
How do you remove extreme rust? ›
6 Easy Ways to Remove Rust from Tools & Hardware | The Home Depot
Do you have to paint over rust encapsulator? ›
Once dry can Rubberized Rust Encapsulator be painted and with what? – This product remains flexible, therefore it is not recommended to paint over it.
Is rust converter a good idea? ›
Rust converters are an excellent solution that transforms rust into something that seems paintable again. They can also make the rusted surface a sand-able material, and as such, rust converters can work as rust remover and preventers.
Corroseal is widely regarded as the best rust converter paint and metal primer available today. Corroseal is easy to apply with a one-step process of using a paintbrush or a roller.
How does rust encapsulator work? ›
Best Rust Encapsulator Uses
It seals rust in and stops it from spreading while acting as either a primer or base coat. Encapsulator is probably the safest and most universal of our rust products as it doesn't much matter what it is applied over – it can even be applied to partially rusted surfaces.
What is the best coating to prevent rust? ›
Galvanize: Galvanizing coats iron or steel in zinc to protect from rust. Zinc corrodes at a much slower rate than iron or steel, so it's highly effective for slowing rust.
What stops rust from spreading? ›
Remove Scale Rust
That newly exposed surface will then also become rusty, and the process will continue all around your car if left unchecked. To stop this development in its tracks, use a wire brush to remove it, then grind down the rough surface with a grinding wheel, and use sandpaper to achieve a smooth surface.
Will painting over rust stop it? ›
Painting over rust can stop the rust from spreading, but there are some things to consider. It's important to think about the extent of the rust and how or if the paint will hold. Scraping off surface-level rust and using a primer can also prevent issues. Painting over rust is a great way to stop it.
Can you use rust converter on a car? ›
How to Remove Rust - SCA Rust Converter // Supercheap Auto
Can you paint over Rust Check? ›
You'll face blistering and peeling paint if you don't remove loose rust first. A primer can help paint adhere to a rusted metal piece, but you still must first remove as much loose rust as possible from the surface first.
What is the best chemical to remove rust? ›
Hydrochloric acid (which is also called muriatic acid in its diluted form), as well as phosphoric acid and sulfuric acid may be used in rust removal formulas using strong acids. These are mineral acids, and they are highly corrosive, especially in concentrated forms.
What is the fastest way to remove rust from metal? ›
Baking Soda (Bicarbonate of Soda) The rusted item can either be dusted with baking soda, or made into a paste with water or vinegar. Apply to the areas and leave for a an hour or so then clean off with a brush.
What kills rust on metal? ›
While there are dozens of commercial rust removers, the acids found in pantry products, such as vinegar, lemon juice, and potatoes, can break the bonds of small amounts of rust from some metals. 1 Add the abrasive action of borax, baking soda, or salt, and you may never need to buy a commercial remover.
