How Thick Can Each Transparent Waterproofing Product Be Applied?

Thickness limits by product

The three products most often compared for transparent waterproofing work have different application rules.

• Trasparente – suitable for pours up to 2cm in a single layer. This makes it a common option for small castings and resin table finishes.
• Icrystal – designed for layers up to 1.5cm per application, with an odourless formulation often preferred for indoor work.
• Prolux – a single-layer polyurethane coating rather than a poured casting resin. It is usually applied thinly to floors and prepared surfaces rather than built up in thick decorative layers.

These figures are maximum per pour or application recommendations, not a target thickness for every job. In practice many coatings are applied thinner for better control and adhesion.

Why pour depth affects the finished result

Pour depth is not just a technical number; it directly influences how the resin cures. A layer that is too thick can trap heat as the resin reacts, which may cause clouding, micro-bubbles, or surface defects in the cured coat.

For clear waterproofing on motorhome interiors or exterior trim, a thinner build often gives a more uniform gloss and reduces the risk of a visible line between layers. If more thickness is genuinely needed, building up in controlled layers within the product’s stated limit is generally safer than exceeding it in one go.

When thickness matters for motorhome work

Motorhome waterproofing jobs rarely need a very thick resin layer. Most surfaces benefit from a smooth, continuous film that sheds water and resists wear. A product like Prolux is more relevant when you need a single protective coating on a floor or high-traffic area, while Trasparente and Icrystal are better suited to smaller cast or surface-sealing tasks where a clear build is useful.

If the area will be walked on, driven over, or exposed to weather, choose the thinnest reliable coating and follow the manufacturer’s recoat guidance. For vertical or curved areas, apply in controlled passes rather than trying to build thickness in one heavy coat.