Never Consider Using Wax-Based or Sacrificial Products to Protect Anodised Surfaces

Anodised aluminium is widely specified in architectural applications for its durability, corrosion resistance, and refined aesthetic. However, incorrect maintenance or ‘protective’ treatment can significantly reduce the long-term performance of anodised surfaces. One of the most persistent misconceptions in façade care is the perceived benefit of wax-based or sacrificial coatings. In practice, these products are fundamentally unsuitable—and often damaging.

Furthermore, wax-based solutions cannot legally be used due to the Regulatory Reform (Fire Safety) Order and therefore carry risk from flame spread.

The following case study from Macmillan Cancer Hospital in London demonstrates why such treatments should be categorically avoided.

The Illusion of Protection

The following images clearly illustrate the short-lived nature of wax-based protection applied to anodised surfaces. Initially, these coatings may impart a uniform sheen, giving the impression of enhanced protection and revitalisation.

Traces of Accumulated Contaminants in the Wax Layer

Deterioration and Degradation of Wax Layer

However, this effect is superficial and temporary.

Within a short period:

- The wax layer begins to degrade unevenly under environmental exposure.

- UV radiation, temperature cycling, and moisture accelerate breakdown.

- The coating develops a patchy, streaked, and inconsistent appearance.

This deterioration results in an unsightly, cloudy texture across the façade panels. Instead of preserving the original anodised finish, the wax introduces visual defects that compromise the architectural intent.

Contamination and Chemical Instability

Beyond aesthetic failure, wax-based products introduce a more serious issue: contamination.

Wax coatings are inherently tacky at a microscopic level, which causes them to:

- Attract airborne particulates (dust, soot, pollutants)

- Retain moisture and environmental residues

- Create a micro-environment conducive to chemical interaction

This contamination becomes embedded within the wax layer, forming a persistent film that is difficult to remove and increasingly aggressive over time.

Surface Degradation

The third image provides critical insight into the true impact of wax-based treatments. After removal of the degraded wax layer, the underlying anodised surface reveals clear signs of deterioration.

This confirms that:

- The chemical composition of the wax, combined with trapped contaminants, contributes to chemical erosion of the anodised layer.

- The anodic oxide surface, which is normally stable and protective, has been compromised.

- The damage is not merely superficial—it represents a degradation of the material itself.

In effect, the wax has not acted as a protective barrier, but rather as a catalyst for accelerated wear.

Why Wax-Based Treatments Are Fundamentally Incompatible

From a materials science perspective, anodised aluminium relies on a controlled oxide layer that is:

- Hard

- Chemically stable

- Non-reactive under typical environmental conditions

Applying a sacrificial organic coating (such as wax) disrupts this equilibrium by:

- Introducing reactive compounds

- Altering surface permeability

- Encouraging contaminant retention

This is fundamentally incompatible with the engineered properties of anodised finishes.

The Correct Approach to Anodised Surface Protection

Rather than relying on temporary, degradable coatings, anodised surfaces require:

- Non-reactive, breathable protective systems

- Chemically stable treatments that do not attract contaminants

- Solutions designed specifically for long-term façade performance

Any product that relies on sacrificial degradation is inherently unsuitable for architectural finishes. These treatments should never be specified or applied in professional façade maintenance or protection strategies.

Unlike wax or sacrificial systems, EVB-23309E provides long-term protection. It resists UV degradation, chemical corrosion and environmental pollution, and offers excellent resistance to acids, bird droppings, salt spray and oxidation.

Furthermore, a fundamental difference from wax coatings is that, once dry, EVB-23309E forms a durable, non-porous surface finish that prevents contaminants from penetrating.

It has been proven that, when applied correctly, EVB-23309E has a service life of 5–10 years or more, without the need for frequent reapplication. Critically, advanced coatings such as EVB-23309E address all the inherent shortcomings of wax-based systems by providing a non-sacrificial, chemically stable barrier, ensuring both the preservation of the anodised layer and the long-term visual integrity of the façade.

*Important* All BROMOCO coatings are the only coatings achieved fire rating BS EN 13501-1 (A1) and are among the very few external wall coatings that can be legally used in key areas such as London.