Rust under the paint or peeling of the putty a month after painting often indicates a violation of the surface preparation technology or the use of low-quality consumables. Professional body repair requires strict adherence to the sequence of operations: degreasing, abrasive treatment, application of primer and topcoat. CARDEA auto repair materials are designed specifically to create reliable adhesion between layers and protect metal from corrosion, which is critical when restoring the geometry and appearance of a vehicle.
The use of specialized chemistry and polymers reduces drying time and minimizes the risk of future defects. Carburate cleaners, degreasers and adhesion activators play the role of a foundation on which the entire paint layer rests. Mistakes at the stage of choosing a cleaning or priming product can negate even the best-quality painting, so understanding the properties of each product in the brand’s line is a must-have skill for the master.
In this article we will analyze the key product categories intended for various stages of body repair. You will learn how to select the correct solvents, putties, and sealants to ensure the longevity of the restored assembly. We will pay special attention to the technical characteristics of the compositions and their compatibility with various types of varnishes and enamels.
Cleaning and degreasing the surface before painting
The first and most important step in any body repair is thorough cleaning of the surface. Degreasers CARDEA effectively removes silicones, oils, waxes and other contaminants that can interfere with adhesion of materials. Improper cleaning will result in craters, fish eyes, and paint peeling, requiring a complete redo of the job.
To achieve an ideal result, it is recommended to use two-stage cleaning: first mechanical removal of dirt, then chemical treatment. It is important to use lint-free wipes to avoid leaving microparticles of fabric on the surface. Universal cleaners Suitable for most applications, but complex stains may require specialized formulations.
- 🧼 Removing bitumen stains: special compounds dissolve heavy petroleum products without damaging the paintwork.
- 💨 Cleaning the injectors: aerosols for purging and cleaning carburetor systems from varnish deposits.
- 🖌️ Degreasing plastic: mild formulas for preparing polymer parts for painting without destroying the structure.
⚠️ Attention: When working with aggressive solvents, be sure to use personal protective equipment for the respiratory system and skin, as chemical vapors can be toxic.
To check the quality of degreasing, run a clean white cloth over the surface. If marks remain on it, the procedure must be repeated.
Putties and leveling compounds
After preparing the metal, the stage of leveling the body geometry begins. CARDEA putties are highly thixotropic, which allows them to be applied in a thick layer without slipping on vertical surfaces. Polyester bases provide fast curing and ease of sanding, which significantly speeds up the repair process.
The choice of putty type depends on the depth of the damage and the type of part being repaired. For deep dents, compounds with reinforcing fiber are used, and for finishing, light finishing putties are used. It is important to thoroughly mix the component with the hardener, observing the proportions specified in the instructions, to avoid underheating or excessive brittleness of the layer.
☑️ Checking the readiness of the putty
When applying the material to aluminum surfaces or galvanized steel, it is necessary to use special adhesive primers. Conventional putties may not provide adequate adhesion to non-ferrous metals, which will lead to peeling during vehicle operation.
Primers and adhesive coatings
Priming is the link between the metal and the finish coat. Acidic soils (wash primer) create a chemical bond with the metal, providing maximum anti-corrosion protection. Epoxy primers create a durable insulating film that prevents moisture and oxygen from accessing the body.
Plastic parts such as bumpers and spoilers require special adhesive primers. They contain components that are embedded in the structure of the polymer, making it susceptible to the application of acrylic or polyurethane paints. Without such a layer, the paint will not stick to the plastic.
| Soil type | Base | Application | Drying time |
|---|---|---|---|
| Acidic (1K) | Polyvinyl butyral | Bare metal, aluminum | 15-30 min |
| Epoxy (2K) | Epoxy resin | Anti-corrosion protection | 2-24 h |
| Acrylic (2K) | Polyurethane | Paintable, sandable | 30 min - 4 h |
| Adhesive | Chlorinated polyolefin | Plastic, bumpers | 10-20 min |
Application of primers should be carried out in several thin layers with interlayer aging. This allows solvents to evaporate evenly and prevents boiling of the material during subsequent drying or paint application.
Sealants and anti-corrosion protection
Protection of welds and hidden cavities is the key to long life of the body after repair. Polyurethane sealants CARDEA maintains elasticity over a wide temperature range, compensating for body vibrations when driving. They do not crack in the cold and do not leak in the sun.
To treat hidden cavities, such as sills and side members, special wax compounds with long spray tubes are used. These materials penetrate microcracks and displace moisture, creating a reliable barrier to corrosion. Regular treatment of such areas significantly extends the life of the car.
- 🚗 Seam sealant: for isolating welded joints from moisture and dirt.
- 🛡️ Anti-gravel: protective coating for arches and thresholds from stone impacts.
- 💧 Movil: penetrating lubricant for the preservation of hidden cavities.
⚠️ Caution: Do not apply sealant to fresh zinc plated welds without pre-treatment as this may compromise the cathodic protection of the metal.
Solvents and auxiliary chemicals
The quality of the finishing coating directly depends on the correctly selected thinner. Solvents CARDEAs are classified by evaporation rate: fast, normal and slow. The choice depends on the ambient temperature and the size of the part to be painted.
Using a thinner that is too fast in hot weather will cause the varnish to become shagreen and dull as the surface cools due to evaporation. Solvent that is too slow in the cold will cause drips and long drying times. Special washes allow you to remove old paint and dirt from the tool without damaging its working surfaces.
When working with two-component materials such as varnishes and enamels, it is important to maintain the “viability” of the mixture. After adding the hardener, the chemical reaction has already started, and the material should not be used after this time has elapsed.
Solvent compatibility table
Fast - for temperatures below +15°C and small parts. Normal - for temperatures +15...+25°C and standard work. Slow - for temperatures above +25°C and large surfaces to avoid shagreen.
Safety precautions and storage of materials
Chemical materials for auto repair belong to the class of hazardous substances and require compliance with storage rules. Temperature should be stable, ranging from +5 to +25 degrees Celsius. Direct sunlight and sources of fire must be excluded from the storage area.
The shelf life of CARDEA materials is usually 12-24 months from the date of production, provided the packaging is intact. Open cans of components (especially hardeners and primers) have a much shorter lifespan due to reaction with air moisture. Closing the container tightly immediately after use is a mandatory rule to save materials.
If materials come into contact with your skin or eyes, immediately rinse the affected area with plenty of water and seek medical attention. Work must be carried out in well-ventilated areas using supply and exhaust ventilation.
Proper storage and compliance with the expiration dates of CARDEA materials guarantees a predictable repair result and the absence of defects in the future.
How to properly dilute CARDEA two-component materials?
The proportions indicated on the label must be strictly observed (for example, 4:1 or 2:1). First, the base is poured into the container, then the hardener and solvent are added. The mixture should be stirred thoroughly for 2-3 minutes, scraping material from the sides and bottom to ensure uniformity.
Can CARDEA materials be mixed with products from other brands?
The manufacturer does not recommend mixing components from different brands. The chemical composition of hardeners and solvents may differ, which will lead to unpredictable reactions: from long drying to complete lack of adhesion or discoloration of the coating.
How to remove automotive chemicals that get on your skin?
Use special hand cleaners without abrasive particles. Do not use gasoline, diesel fuel or harsh solvents (acetone, 646) to wash your hands, as they destroy the fatty layer of the skin and can cause dermatitis.
What is the shelf life of opened jars of soil?
An open jar of one-component primer can be stored for up to 6 months by tightly closing the lid and turning the jar upside down (creating an air lock). Two-component mixtures (base + hardener) cannot be stored and must be used within the specified pot life.
Do I need to sand acidic soil?
Acid wash primer is usually not sanded if it is applied in a thin layer. Filling acrylic primer is immediately applied to it. It should only be sanded if it has formed streaks or if it has dried too long (more than 24 hours) before applying the next coat, in which case a light sanding is required.