In modern body repair, the quality of anti-corrosion protection is the foundation for the durability of the restored coating. One of the most popular products on the paint and varnish market for Russia and the CIS is rightfully considered epoxy primer Reoflex, which combines high adhesive properties and affordable cost. The technical characteristics of this material, described in the TDS (Technical Documentation), allow it to be used both for full body painting and for local repair of minor damage, providing reliable metal insulation.
However, to achieve the result declared by the manufacturer, it is not enough to simply buy a can of paint. It is necessary to strictly observe mixing proportions, take into account the holding time and drying temperature. Reoflex Epoxy Primer - This is a two-component system that requires precise dosing of the hardener, and any deviations from the regulations may lead to reduced chemical resistance or adhesion problems in the future.
In this article we will analyze in detail all aspects of working with this product, relying on official technical documentation and the practical experience of craftsmen. You will learn how to properly prepare the surface, what tools are needed for application, and how to avoid common mistakes that beginners make when working with epoxy compounds. Understanding the chemistry of the process will help you create a coating that will last for decades.
Chemical composition and physical properties
The basis of the product is epoxy resin, which, when interacting with a hardener, forms a very strong polymer network. This mesh is inert to most aggressive media, including road chemicals, gasoline and oils. Unlike acidic primers, epoxy does not contain phosphoric acid, making it safe for all types of metals, including aluminum, galvanized steel, and even some plastics after proper preparation.
The most important parameter specified in the TDS is the dry matter content. U Reoflex this figure is quite high, which means less shrinkage of the material after evaporation of the solvent. This is critical to maintaining surface geometry and preventing sanding marks from appearing under the finish coat. The high density of the film also provides excellent waterproofing, completely blocking the access of moisture and oxygen to the body metal.
⚠️ Attention: Epoxy primers have a limited lifetime after mixing the components. At a temperature of +20°C, the finished mixture must be used within 60 minutes, after which the material begins to thicken irreversibly and loses its properties.
The color scheme of the product also plays a role in the technological process. Most often, the primer has a light gray or yellowish tint, which makes it easy to control coverage and uniformity of application. The pigments used in the composition have high light resistance, although this is not a critical parameter, since the primer is always covered with a base or acrylic.
Applications and compatibility
Scope of use Reoflex epoxy primer is extremely wide, making it a universal solution for workshops of any level. It is ideal for application to bare metal after mechanical stripping or sandblasting. Unlike some analogues, this product can be applied to old, but firmly adhering paint coatings, ensuring reliable adhesion.
The compatibility of the material with various types of finishing coatings deserves special attention. On top of the dried epoxy primer you can apply:
- 🚗 Acrylic enamels and varnishes (2K)
- 🎨 Basecoat (metallic or pearlescent)
- 🛡️ Polyurethane protective compounds
- 🔧 Putties (subject to preliminary sanding)
An important aspect is the possibility of using soil as an insulator. If there are areas on the body with old paint, which may be incompatible with new materials (for example, nitro enamel or some types of acrylic), a layer Reoflex Epoxy will securely seal the surface. This will prevent the old paint from lifting and causing defects known as "craters" or "orange peel".
In addition, the material has proven itself in the repair of plastic body parts. Bumpers, sills and spoilers made of plastic require a special approach, and epoxy primer here acts as an adhesion bridge. However, for smooth plastics, it is recommended to first use a special adhesion promoter or thoroughly mechanically matte the surface with P500-P600 abrasive.
Surface preparation technology
The quality of the final result depends 80% on surface preparation. Even the most expensive epoxy primer will not adhere to oily, damp or glossy surfaces. The first step should always be a thorough wash of the part using degreasing compounds. All traces of oil, bitumen, silicone and technical grease must be removed.
After degreasing, the mechanical processing stage follows. If you are working with bare metal, you need to remove the oxide film and create a risk for snagging. The optimal solution is to use abrasive materials of P180-P240 gradation. Coarser grains can lead to subsidence of the soil in the grooves, and too fine grains (above P320) will not provide sufficient adhesion.
☑️ Surface preparation checklist
Particular attention should be paid to hard-to-reach areas, welds and edges. This is where corrosion most often begins. It is recommended to blow out all joints with compressed air to remove any abrasive dust that may have clogged inside. After mechanical treatment, the surface must be degreased again and wiped with a sticky cloth immediately before applying the primer.
⚠️ Attention: Do not touch the prepared surface with your hands! Greasy fingerprints can cause local soil peeling in the future. Use clean gloves at all stages of work.
If pockets of corrosion remain on the surface, they must be removed mechanically to bare metal. Reoflex It has good anti-corrosion properties, but it is not a rust converter. Applying primer over oxides will only preserve the process of destruction of the metal under the coating film.
Preparation of the working mixture and application
Preparing the mixture is the stage where mistakes most often occur. According to TDS, epoxy primer Reoflex mixed with the hardener in a strict weight ratio of 100:15. The use of electronic scales is a mandatory requirement to obtain quality material. Mixing “by eye” or by volume is unacceptable, since the density of the components may differ.
After adding the hardener, the mixture must be thoroughly mixed for 2-3 minutes, paying attention to the walls and bottom of the container. An uneven mixture will result in soft spots on the surface that will not dry properly. To dilute the material to working viscosity, a special solvent for epoxy primers is used, the amount of which depends on the application method and ambient temperature.
| Parameter | Value/Proportion | Note |
|---|---|---|
| Base: Hardener | 100 : 15 (by weight) | Strictly by scale |
| Solvent | 5-10% by weight of the mixture | Depends on temperature |
| Mixture life time | 60 min at +20°C | In an open container |
| Number of layers | 2-3 wet layers | With interlayer drying |
| Interlayer drying | 15-30 min at +20°C | Until matte |
Application is carried out using a paint sprayer with a nozzle diameter of 1.6–1.8 mm. The pressure at the gun inlet should be 3.0–3.5 bar. The primer is applied in 2-3 wet layers with an interlayer exposure of 15-30 minutes (at +20°C). It is important not to fill the surface immediately to avoid drips, but also not to overdry the layer, otherwise the interlayer adhesion will be impaired.
What happens if the proportion of the hardener is violated?
If there is too much hardener, the material will become too brittle and may crack. If there is not enough hardener, the primer will remain sticky and will not gain hardness, which will lead to peeling of the finish coat.
Drying time and sanding
Complete polymerization time epoxy primer directly depends on the ambient temperature. At standard +20°C, the material dries in about 12 hours, after which it can be sanded. However, if it is possible to use infrared drying or place the part in a chamber at +60°C, the drying time is reduced to 40-60 minutes. Heat treatment also improves the physical and mechanical properties of the coating.
Grinding the primer is necessary in two cases: if you plan to apply putty (although epoxy is often applied to the metal, and putty on top, but there are exceptions in repair schemes) or if the surface has application defects (shagreen, dust). For grinding, it is recommended to use P320-P400 abrasives. Larger grains can leave risks that will appear through the base, while fine grains will clog the pores of the soil.
Important nuance: Reoflex Epoxy after complete polymerization it becomes chemically inert. This means that if you leave the primer without sanding for more than 7 days (depending on conditions), its adhesion to subsequent layers may deteriorate. In this case, the surface must be sanded to a matte finish in order to provide a mechanical grip for the next layer.
When sanding epoxy primer, use dry sanding. Water entering micropores before applying the base may cause swelling of the coating in the future.
If the primer was applied as a final insulator and does not require leveling, it is not necessary to sand it if the surface is level. It is enough to remove dust and degrease. However, for an ideal result and removal of a possible “shagreen” structure, light rubbing with P500-P600 abrasive will only be beneficial.
Common mistakes and safety precautions
Working with chemical materials requires compliance with safety measures. Solvent vapors and soil components can be harmful to the respiratory system and skin. The use of a respirator with carbon filters and protective gloves is mandatory. The area must be well ventilated to avoid the accumulation of explosive vapor concentrations.
One of the common mistakes is applying primer to wet metal or at high air humidity. Epoxy compounds are sensitive to moisture condensation. If there is dew on the metal or the room is damp, dull spots or “greying” may appear on the surface of the dried soil. This is a defect that will have to be sanded and repainted.
⚠️ Attention: Do not apply epoxy primer over acidic (phosphate) primers without first sanding and sealing. A chemical reaction between the components can cause swelling and peeling of the entire coating.
Another problem is the wrong choice of solvent. The use of aggressive or volatile solvents may cause the material to boil on the surface or cause pores to form. Use only thinners recommended by the manufacturer that are appropriate for the temperature conditions in the spray booth.
Maintaining temperature and humidity conditions is a key factor for success. Ideal conditions: +20°C and humidity 50-60%.
It is also worth mentioning the storage of components. Cans of primer and hardener should be stored in tightly closed containers at a temperature of +5 to +30°C. Moisture getting inside the can of hardener will cause it to deteriorate and crystallize. Always close lids tightly immediately after use.
FAQ: Frequently asked questions
Can Reoflex epoxy primer be used over rust?
No, you can't. Epoxy primer is designed to be applied to clean, dry metal. It creates an insulating film, but does not stop corrosion once it has started. Rust must be completely removed mechanically or chemically before priming.
Do I need to sand epoxy primer before painting?
If less than 7 days have passed since application and the surface is smooth, it is not necessary to sand, just degrease. If more time has passed or there are defects (dust, shagreen), sanding with P400-P500 abrasive is required to ensure adhesion.
Can epoxy primer be thinned with regular 646 solvent?
The use of 646 solvent is not recommended, as it can be too aggressive for epoxy resins and disrupt the polymerization process. It is better to use specialized thinners for epoxy primers specified in the manufacturer’s technical specification sheet.
Is Reoflex compatible with polyester putties?
Yes, compatible. However, it is better to apply the putty on bare metal, and only then cover it with epoxy primer for insulation. If you apply primer first, make sure it is completely dry and sanded before applying putty, although classic technology recommends the reverse sequence: Metal -> Putty -> Epoxy -> Acrylic.
What is the shelf life of mixed soil?
The shelf life of the finished mixture (use potential) is about 60 minutes at a temperature of +20°C. After this time, the material begins to thicken and becomes unsuitable for application. Mixed soil cannot be stored.