Metal painting is a vast subject that deserves an entire book! This work, in itself, is not difficult. It's even easier to paint metal than wood or plaster!
- Prepare the metal
- Paint the metal
Prepare the metal
Problems concerning the painting of metal (or rather "metals") are primarily due to the need for an impeccable preparation, especially for ferrous metals that have an unfortunate tendency to... rust!
Their preparation must be very neat, especially when the metal is not new or is already painted. It is almost always necessary to bare the metal and apply a treatment that will delay (because it never stops) corrosion.
New metal In principle, it does not need any significant preparation since it is - a priori - free of corrosion. Very smooth, however it is often difficult to paint.
The old metals must in principle be stripped (if they are already painted), derust and degreased: so many operations ungrateful, tedious, but should not be neglected, if we do not want to see all its efforts reduced to nothing in a few months.
The level of intervention depends on the nature and condition of the metal.
Rusty ferrous metals have to be:
- scraped, sanded, brushed;
- the corrosion must be stopped by a chemical rust destroyer or a rust transformer.
Painted metals must be stripped (with a heat gun or a chemical stripper) or the old paint will peel off and take off.
Paint the metal
Ferrous metals (sheet metal, cast iron, steel, etc.) can normally be painted directly with a good specific paint containing anti-rust agents.
If the metallic object is placed outside, according to the degree of exposure to bad weather, we will apply:
- a sub-layer of minium (still as effective);
- an undercoat of antirust paint;
- finally a painting for metal (there is today a hammered effect very decorative, especially for wrought iron) possibly specialized (radiators, high temperatures, for non-ferrous metals, etc.).
Non-ferrous metals (copper, aluminum, zinc, etc.) suffer little or no corrosion (in the clear, they do not rust). Nevertheless, they are difficult to paint because their surface is smooth and sometimes chemically incompatible with an ordinary paint (the metal seems to refuse it).
You will find in the trade specialized paintings which constitute a "primer" then allowing the normal painting to adhere. You can use this kind of product to paint a bucket, a washing machine, a tin, a gutter, accessories often used in the garden to decorate and / or accommodate plants.
Note that there are also varnishes specially designed for the protection and embellishment of metals.
(photos / visuals: © DIY-Prod, except special mention)
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