Varieties of heat-resistant paints for the muffler and the painting procedure
To paint the outer surface of the exhaust system, use an anti-corrosion paint for the muffler and the exhaust pipe (heat resistant). There are special paints and varnishes designed for the repair of car parts exposed to frequent heating. True, the metal is destroyed not only from the outside, but also from the inside. The exterior paint of the exhaust system and muffler helps extend the life of auto parts.
Requirements for the coloring composition
To paint the exhaust system of a car, a thermal paint is selected that has the following characteristics:
- purpose - to paint the exhaust system and muffler (outside);
- heat-resistant (applied to a surface exposed to constant or periodic heating);
- can be applied by roller, brush, gun, special electrostatic spray;
- the applied layer of paint hardens only under the influence of high temperatures;
- after hardening, the coating acquires resistance to water, corrosion, high temperatures;
- additionally protects the system from fire;
- it is distinguished by a long period of protection and decorative properties.
How to choose the right paint
To paint a car muffler, they purchase a certain type of paint and varnish materials, which are specially designed for metalworking under constant heating conditions.
Silicone
It is a heat-resistant (heat-resistant) paint that is used for protective and decorative painting of automotive parts exposed to high temperatures (especially for painting the exhaust system and muffler) . Contains silicone fillers, metallic additives, solvents. It is recommended to apply only to metal elements. The paint layer after application hardens under the influence of high temperatures.
Powder
These are pulverulent compositions of the thermosetting type based on hardeners and resins (epoxy, acrylate, polyester, polyurethane) which, after application on metallic elements, give a hard, flame-retardant, heat-resistant and corrosion-resistant film. humidity. They are applied with a special spray gun which electrostatically charges the powder particles which stick to grounded metal parts and form a coating.
A powder bake is required after application. For this purpose, ovens or infrared lamps are used with a heating temperature of + 180 ...+ 200 degrees Celsius for 10 to 15 minutes. After exposure to high temperatures, the powders turn into a liquid state and adhere to the metal.
Aerosol
Easy to use spray paint, based on organosilicon resins. It is used for metal parts that often heat up. Baking paint is necessary for polymerization.
Coloring order
Muffler painting consists of three main steps:
- preparation of metallic elements;
- painting of automobile parts;
- baking paint.
Preparatory work
Preparation steps:
- use a pneumatic sandblaster jet to clean the surface of dirt;
- dry the exhaust system;
- treat the metal with a rust converter;
- remove rust residue;
- using a chemical solvent, remove oil and various stains;
- sand the surface with sandpaper;
- wipe the surface with acetone;
- apply a primer (only for silicone paints).
Muffler painting
The method of painting the exhaust system and muffler depends on the chosen paint material:
- Silicone.The paint is applied to the surface with a brush, roller or spray gun. Spare parts are painted in 1-2 layers, observing the interval specified in the instructions for drying each.
- Powder. To apply powder to automotive parts, an electrostatic gun is used (for applying powder paint). A filler must be applied to the surface to be painted.
- Aerosol. The spray is shaken and sprayed on the car part from a distance of 20-30 centimeters. It is recommended to apply 2-3 coats of paint. The interlaminar exposure should be 5 to 30 minutes (according to the manufacturer's recommendations).
Thermal treatment
After painting, it is recommended to heat the painted surface of the muffler. Spare parts must be baked in a special oven. Infrared lamps can be used to heat the painted exhaust system. The main thing is to bake the object at a temperature of 180-200 degrees Celsius for 10-15 minutes.
In the process of heating, the process of polymerization and hardening of the coating occurs. It is not recommended to use a baking oven to bake automotive parts.
Additional tips and tricks
Tips (useful for painting a muffler):
- before painting, it is recommended to thoroughly clean the metal elements, remove the remnants of old paint;
- work with any type of painting materials, preferably in an open-air respirator;
- before painting, car parts must be warmed up (to melt and remove oil and grease more easily);
- so that the metal does not rust, the entire surface should be evenly covered with paint, leaving no gaps;
- any heat-resistant paint requires heating after application, during which it hardens;
- after heating, the automobile part must cool in the open air; during the entire cooling period, do not touch the painted surface;
- for baking a layer of paint, it is forbidden to use gas ovens for baking;
- it is forbidden to inhale the vapors of paints and varnishes, to taste the compositions.
Immediately after applying heat-resistant paint to the surface of the exhaust system and muffler, the coating can be easily damaged. The paint layer only gains in hardness and resistance after baking.