Painting galvanized metal : why , what and how ?

reasons to paint galvanized

can not wait for the destruction of the zinc layer and prevent it by painting the newly installed structures, and to carry out this procedure regularly.If the first galvanized roof or other metal operated in a pure form, there are reasons to pay attention to the risk of destruction of material:

• white coating fully or partially covering sheets, said the destruction and thinning of the zinc layer due to its oxidation;
• yellowing galvanizing - an important signal impending rust;It indicates that the zinc layer has not sufficiently effective to withstand corrosive environments.

If you skip the bells, the following may need replacing galvanized roof, rather than repair it.

In addition, galvanized roof does not fit well into modern exteriors, therefore painting of such steel products can carry primarily decorative.

The paint galvanized metal?

steel sheets, is widely used in everyday life and in the construction, as a rule, are hot-dip galvanized in the enterprise.There are also electroplating, gas thermal, termodifuzionnoe and cold galvanizing.They all perform approximately the same task - to protect the metal from corrosion by applying zinc.But if the first four methods are available only in a production environment, the cold galvanizing can be done by hand.

1. Painting special polymer - this is the technology of cold galvanizing.That is, in fact you apply a zinc layer again or additionally, depending on the operating time of the roof.The composition of the paint is called a zinc bearing and freely sold in DIY stores.It contains 89-93% zinc, and the amount depends on its level of protection.The color palette is varied, to talk about a decorative finish.
2. If you are unable or unwilling to use a zinc-containing paint, you can use powder formulations.They are sold as a finished product, and polymerized by heating to form a durable and wear-resistant protective layer.
3. Paint galvanized and polyester, plastisol, water-resistant aluminum compounds, although their defense order of magnitude below the above funds.
   

   Note!Do not use galvanized metal traditional alkyd and oil paints.They are not only able to withstand the corrosive environment, but also reacts with zinc, destroy existing protection.

In any case, it should be remembered that reduces the adhesion of the zinc layer and the steel has the ability to greatly expand when heated.Whatever paint you choose, it should adhere well even with a smooth surface and be very flexible.

Self-dip galvanized roof: step by step instructions enameling

Use zinc-containing primer enamel is no more difficult than conventional types of paints, so for sure you will handle it galvanized the first time.cold galvanizing technology includes several steps:

1. Surface preparation: cleaning of debris and dust removal of old polymer layer, if it was.Do not damage the galvanized preserved!
2. metal sheets should be washed with detergent or water pressure to remove tiny particles of fat and plaque.
3. on completely dry and clean metal apply the first coat of paint tsinkonapolnennoy.It is important to put it subtly, but very evenly.Wait until completely dry.
4. Repeat 3 point two more times for flawless coverage without flaws, and even color.

Nothing complicated in the process of painting is no galvanizing, and it really perform their own hands.The main thing - do not hurry up and apply all possible accuracy when working.