Paint or paint the aluminum and remove it

If aluminum is to be painted or painted, the chemical reactivity of the soft metal must be utilized for the adhesion. Even when properly painted in a two-coat process, the paint will only last on areas that are not used to any significant extent. For frequently touched door and window frames painting is not recommended.

Coloring versus oxidation

The painting of aluminum is difficult in any form and only partially durable, but this does not apply to labels, for example, with felt-tip pen. Aluminum surfaces are always exposed to natural oxidation if they have not been sealed airtight by foliation or a primer coat.

Theoretically, aluminum surfaces can be colored by painting them with a felt-tip pen. The oxidation, however, ensures an uneven color development. With partial lettering this unevenness can be well observed.

Remove unwanted paint immediately

Even when aluminum is ground, the color can hardly be made uniform. In contrast to hard metals, the removal is always subject to oxidation and can only be compensated by complete recoating. Put simply, aluminum is a constantly "working" metal that never completely fails to react with oxygen, even in the anodised state.

Since aluminum is sensitive to acids and alkalis, painted areas and surfaces can only be removed by sanding or covering. Special anodizing processes can delay color removability as they slow the oxidation down. Helpful may also be special alloys that are copper or chrome plating.

As a general rule, painted aluminum should be cleaned or treated as soon as possible. With every hour of oxidation, all paint jobs "burn" deeper and "bond" with a tough oxide film. This also applies to the primers for paint coatings, which should therefore be chosen transparently in any case.

Tips & Tricks

Your aluminum always oxidizes, whether anodized or burnished. Only an airtight seal prevents this process. Therefore, when labeling aluminum, for example with felt-tip pen, it must be remembered that the paint application without painting, varnishing or painting "burns in" through natural oxidation.

Video Board: Stripping Paint From Aluminum Intake!