Metal putty high-temperature, heat-resistant, polyester compounds

Types of putties

The following types of putties are most often used to repair metal surfaces:

Two-component polyester.
Epoxy.
Nitro putty.

Now let's take a closer look at the features of each type of these materials.

Two-component polyester

These putties are called two-component because before use, a hardener must be added to the bulk of the mixture . It should be noted that the bulk of materials intended for working with metal are polyester. (See also the article Features of decorative putty.)

The main feature of this coating is that it practically does not shrink and can be applied in several layers, and also has good adhesion.

Note! Polyester materials cannot be applied to paint coatings, anti-corrosion primers and plastic materials.

Such mixtures are of the following types:

Finishing or finishing – provide a smooth surface, seal cracks, pores, dents.
Fine-grained - designed to eliminate minor defects and irregularities. They are easy to process with your own hands, in addition, they can be applied to surfaces treated with rough coatings.
Coarse and medium grit - designed for filling large holes and dents. Can be applied directly to steel, fiberglass or old putty.

Often, polyester putties are produced reinforced with metal powders or fiberglass. The latter are used to seal through holes, irregularities and deep dents. However, such coatings are unstable to mechanical loads and vibrations. (See also the article Which putty is better to putty on drywall.)

Repairing a metal surface with a polyester mixture

Advice! If you need a heat-resistant putty for metal, you should pay attention to some polyester mixtures that have this property.

Mixtures with metal powder are resistant to vibration, but can only be used on solid surfaces.

Epoxy

Epoxy putty for metal is also two-component.

Its main advantages include the following points:

High strength.
Has anti-corrosion properties.
Resistant to chemicals.
Shrinkage after drying is very insignificant.
Can be applied in fairly thick layers.
It has good adhesion to any type of surface.
Easily processed with abrasive tools.
Durability.
Can be used over old paint or putty. It does not require priming; simply degrease the surface.

The composition, as a rule, hardens after 6-8 hours, after which further processing can begin. Other advantages of this material include its low price.

Nitro putties

Nitro putties are one-component, ready-to-use compounds. They are quite easy to use, but they give a large shrinkage, which is up to 15 percent. Therefore, they are used to repair small scratches and irregularities. .

The layer applied at a time is approximately 0.1 millimeter, so the surface is covered with it several times. Before you putty the metal, it is advisable to use a primary primer.

The bulk of the mass of such mixtures is created by special fillers. As a rule, all kinds of neutral fibers or powders are used for these purposes, which increase the volume of the material. Most often the composition includes metal powders, fiberglass or minerals.

In the photo - a surface coated with a composition with glass fibers

Depending on the filler, the compositions are divided into:

Fine-grained – allow you to get a smooth surface, practically without holes and pores.
Coarse-grained - have pores, but at the same time they are stronger than fine-grained, making them more difficult to process.
Reinforced with fiberglass or metal powder. They are the most durable material that can even be used to seal through holes in metal.
Lightweight. Designed to fill large masses without increasing parts.

Scope of application of metal putties

Metal putties can be used for surfaces made of ferrous and non-ferrous metals, as well as galvanized products. Some types are also suitable for galvanized surfaces. Putties are used for the following operations:

leveling: the composition fills dents, cracks and scratches;
strengthening surfaces by increasing the thickness of the product;
sealing holes;
anti-corrosion treatment of surfaces, including those already affected by rust.

Metal putties are wear-resistant and can withstand weathering, moisture, frost and other adverse influences. They are usually applied before painting.

Metal putty is purchased for repair and protection against corrosion of metal building structures and elements: fences, railings, stairs, metal garages and gates, door hinges, etc. Such putties are also useful for processing metal pipelines.

Metal putties are in demand not only in construction. Thus, they are actively used in the repair of cars, water transport, industrial equipment, and restoration of the surface of various metal products.

Polyester putties

Polyester putties are very popular today, despite the fact that their price is quite high. But the cost is compensated by the high qualities of the material.

The basis of such compositions are unsaturated polyester resins. The composition may also include various fillers: fiberglass, aluminum powder, glass microgranules.

Advantages of polyester putties:

low shrinkage (about 0.5%), due to which the composition can be applied in several layers and without fear of cracks;
good grip on the surface;
strength, resistance to external influences;
heat resistance: many compositions can withstand up to 100 degrees, and some can withstand much higher values. Thus, the high-temperature putty ROBERLO SN96 can withstand up to 250 degrees Celsius (it is usually used for car repairs);
dry quickly.

The presence of additional components gives polyester putties special properties. Thus, compositions with fiberglass filler can be used to seal even fairly large holes in metal. The applied layer has increased strength.

“Aluminum” putty (marked Alu on the packaging) makes the surface of the product more resistant to damage, vibration and vibration. Heat-resistant primer for metal up to 300 degrees? In addition, the composition with aluminum is heat-resistant.

Polyester putties are two-component. They are sold as a set of two containers (or jars), one containing the putty base and the other containing the hardener. These two components must be thoroughly mixed together immediately before use and used within a few minutes.

Using polyester putties, metal surfaces of varying degrees of damage are leveled. With skillful work, the mixture lays out in an even layer. For a better result, you can first use a starting (“coarse”) polyester putty, and then a finishing putty (with a fine fraction) for finishing for painting.

There are also universal formulations.

Pentaphthalic putty

Pentaphthalic varnish acts as a binding component in such putties. The composition also includes fillers, pigments, organic solvent, etc. Such putties are usually inexpensive.

Pentaphthalic putties have a two-component composition (base plus hardener). The degree of shrinkage is quite high - 3-5%, so the scope of application of the composition is limited. It is often used to eliminate minor surface defects on ferrous or primed metal surfaces. Usually the mixture is applied in several thin layers up to 0.5 mm each, the total application thickness is up to 2 mm.

The popular pentaphthalic putty PF-002 takes quite a long time to dry - at a temperature of 20 degrees it will take up to a day. But the composition adheres well to primers and is not fluid. When applied correctly, it forms a smooth layer that is easy to sand. The top of the putty can be coated with pentaphthalic, oil, alkyd-urethane and other paints.

Epoxy putty

Such putties consist of a solution of epoxy resins and a hardener. They are very popular because in most qualities they are not much inferior to their polyester analogues, and are cheaper than them.

Main characteristics of polyester putties:

shrinkage rate - only 0.1%;
strength;
high adhesion to any type of surface;
long drying: the composition hardens in 20 minutes, but it takes a day to dry completely.

Epoxy putty is quite fluid. Therefore, to treat vertical surfaces, it is recommended to mix chalk, kaolin or talc into it.

Nitrocellulose putties

They are sold in the form of a ready-made mixture that can be puttied on immediately after opening the container.

Nitro putty has the highest degree of shrinkage - up to 15%. Therefore, it is applied in a very thin layer and, accordingly, is only suitable for repairing minor defects (chips, scratches).

The advantages include fairly quick drying - about two hours. In addition, nitro putties have good resistance to high temperatures.

Additional Information:

TERMO – epoxy putty Termo putty is a two-component epoxy putty for powder paints, designed for repairing minor damage and unevenness of metal surfaces. It is characterized by a short curing period, similar to epoxies, and a very high level of mechanical strength. How does putty for metal differ from putty for plastic? It also has excellent adhesion and high temperature resistance.

The curing process can take place either outdoors or in an oven.

For example, such a leveling mixture dries quickly upon contact with air, and therefore, after opening the package, it is better to use it immediately and not leave it for later. In addition, nitro putty, despite fast drying, is characterized by the most intense shrinkage (up to 15%).

“TROTON Spec High Temp is a high-quality two-component cold-curing polyester putty with excellent resistance to high temperatures up to 200°C. The electrically conductive composition is intended primarily for surface treatment in preparation for powder coating. The product has elasticity and very high adhesion to various substrates after appropriate preparation.

It is to prevent such conflict situations and to be able to track the entire technological chain to identify violations, Audrey LLC

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Types of putties for metal and their differences

Assortment of consumables for body work in a specialized store

Putty for metal is a product with a paste-like, less often liquid, consistency. By applying the product to metal surfaces, minor defects can be eliminated before subsequent painting.

Consistency of putty, ready for use

According to the composition, putties for leveling metal surfaces are divided into the following types:

Polyester compounds with low shrinkage and low tendency to crack;
Epoxy compositions are the most common, since the quality of the finished result is slightly inferior to polyester analogues, while their price is lower;
Pentaphthalic compositions are characterized by low cost and a high degree of shrinkage (on average 5%);
Nitro putties are characterized by even greater shrinkage compared to pentaphthalic analogues, and therefore are used to level out minor relief.

Conventionally, all of the listed compositions can be divided into:

One-component - just open the package, mix and you can apply;
Two-component - sold in the form of a base and a hardener, which must be mixed until smooth.

What to choose - one-component or two-component formulations

Among the listed modifications, only nitro putties do not require mixing with a hardener. But this composition has more disadvantages than advantages.

Types of putties

There are putties for metal, which are divided into one- and two-component. Manufacturers produce mixtures of different compositions:

polyester;
epoxy;
nitro putty;
pentaphthalic.

Each composition has its own specific characteristics and features when applied to the surface. If you have a choice when buying a putty for metal products, you need to pay attention to its properties; a high-quality putty should have the following:

short drying time;
high adhesion to the coating;
high degree of ductility, even after drying;
ease of application and maximum surface leveling;
minimum shrinkage after completion of work;
compatibility with varnishes or coloring components.

Which metal putty is better, everyone decides for themselves when purchasing.

Polyester

Two-component putties are polyester-based compounds to which a hardener must be added before use. The advantages of this type of putty are that it:

does not shrink;
has a high degree of adhesion to the surface;
heat resistant;
easy to apply.

On the construction market, polyester putties are presented in the following versions:

Finishing or finishing. They provide sealing of cracks, dents and scratches, at the same time maximally leveling the coating.
Fine-grained composition. This option is used to eliminate small cracks and irregularities.
Medium-grained and coarse-grained. Such mixtures can be used to fill large holes and dents; they can be applied either to a clean surface or to one previously treated with putty.

DIY metal putty

Before you start puttingtying a metal surface with your own hands, you need to decide on the type of mixture that will be suitable in this case. However, among the variety of putty materials for metal, the most popular is a mixture with an epoxy composition.

After acquiring the necessary material, a step-by-step process occurs:

The first step is to prepare the coating well, remove rust and dirt, degrease and prime it. If you use an epoxy mixture, you can do without a primer.
A certain amount of putty that will be needed for the job must be mixed with a hardener. After thoroughly mixing the base until smooth, you can begin puttying.
Using a thin spatula, apply the mixture to scratches, dents or existing holes in the metal. The excess is carefully removed with the same spatula so that there are no flaws.
When the putty solution hardens on the surface, it must be sanded with sandpaper soaked in water. The result is a smooth and even surface, ready for powder painting in the desired color.

Features of applying putty to metal surfaces

If you decide to treat the surface with a putty layer yourself, you need to choose the appropriate type of material; everyone decides for themselves which type is more suitable for a particular situation. However, epoxy is more in demand, so the description of the work will be carried out with it. The work steps include the following:

They start by preparing the surface for applying putty. The product must be thoroughly cleaned of all types of contaminants and corrosive areas. Next, degreasing is carried out; any universal product is suitable. Treatment with a primer mixture. The epoxy composition does not require priming.
The putty mixture is mixed with the hardener. There is no need to mix the entire composition; a small amount is selected, sufficient to process a specific product. It is necessary to obtain a homogeneous mass.
A thin spatula is used, it applies the composition to the flaws, and excess parts are also removed immediately with the help of it. If you need to apply 2-3 layers, then each one must dry completely.
After the layer has completely hardened, the surface should be sanded using sandpaper moistened with water. As a result, you get a smooth base that will be ready for the painting or varnishing stage.

When working with epoxy putty, the technician must wear protective gloves. Work carefully to prevent the composition from coming into contact with the skin.

The product must be thoroughly cleaned of all types of contaminants and corrosive areas.

Additional recommendations

Metal coating experts recommend the following:

Before starting the work process, you should definitely read the instructions from the manufacturer, first of all, pay attention to the timing of application and the purpose of the putty for a specific coating.
It is better to prepare the putty mixture in batches so that you have time to use the required volume before it hardens.
The surface that requires treatment must be clean and free of grease. You can use a universal degreaser for this.
The hardener and base must be mixed well according to the proportions, otherwise defects may occur during the work process.
The mixture is applied in thin layers, if there are more than 3 layers, you need to give each layer time to dry. The polyester mixture is dried at a temperature no higher than +75 degrees, otherwise it will crack.

If you need to choose a high-quality putty mixture for working with metal parts, pay attention to its purpose and properties specified by the manufacturer.

How to make metal putty with your own hands

To prepare a two-component composition, you need to prepare a clean container where the components will be combined. They start by calculating how much mixture will be prepared, the prepared amount should be enough for 30-40 minutes of work, the remaining composition cannot be used after this period has expired, it will simply harden. It won't work to dilute it later.

The proportions must be observed; they are indicated by the manufacturer in the instructions on the product packaging. If the ratio of components is violated, the declared properties may not appear. Mix thoroughly to obtain a homogeneous mass without lumps.

The proportions must be observed; they are indicated by the manufacturer in the instructions on the product packaging.

Puttying a metal surface allows you to get an even coating again, and can also create a protective layer against corrosion. To get the desired result, the choice of composition should be taken carefully. The article described the types of products on the market; the choice should be made based on their characteristics. The process itself does not take much time and is not difficult, so you can do it yourself. The main thing is to properly prepare the base.