How Does Prolux Prevent UV Yellowing?

Why the aliphatic formulation matters

Not all polyurethane coatings behave the same way under sunlight. Aliphatic polyurethane is generally selected for exterior work because its chemical structure is less reactive to UV light than aromatic alternatives. In practice, that means the cured film is less likely to develop the amber or chalky appearance that can appear on some clear or light-coloured coatings.

For Prolux, this UV resistance is built into the two-component system rather than relying on a sacrificial top layer. The coating remains waterproof and abrasion resistant while giving the surface a more stable colour over time.

Using Prolux on van roofs and weather-exposed surfaces

Prolux can be applied to prepared steel, concrete, ceramic, plastic and fibreglass, which covers many surfaces used in van conversions and roof repairs. Proper surface preparation is important, especially on metal, where adhesion depends on a clean, sound substrate.

• Available in gloss or satin, and can be tinted to a chosen colour
• Mixed as two pre-measured components in a 2:1 ratio
• CE marked to EN 1504-2, with a Declaration of Performance

Because the product is suitable for driveable surfaces, it is also designed to cope with foot and vehicle traffic as well as exposure to weathering.

When UV stability matters

UV stability becomes more important when a surface is in near-constant daylight, such as a van roof, a balcony, or an external parking area. On these surfaces, a coating that yellows can look aged quickly and may need more frequent maintenance. Choosing an aliphatic polyurethane finish can reduce that visual change and help preserve the look of the build.

If you are planning a waterproof roofing product for a van, consider UV resistance alongside adhesion, flexibility and ease of application. The best result usually comes from matching the coating to the prepared substrate rather than relying on one property alone.