Anti-Infiltration Products for Metal and Plastic

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Anti-infiltration products for metal and plastic are specialist coatings and fillers formulated to bond with non-porous surfaces when preparation is carried out correctly. In the Resin Pro professional range, Prolux PU coating is designed for plastic and properly prepared steel, while CROP 2K Fiberglass Putty can fill and repair metal, aluminium and plastic. Not every anti-infiltration product is appropriate for these substrates, so selecting a product that explicitly lists metal or plastic compatibility is important.

If you are sealing a mixed-surface project or repairing a plastic or metal component, this guide explains which products are worth considering and what basic preparation helps them adhere reliably.

Products designed for metal and plastic

Two products in the professional range are particularly relevant when working with metal or plastic. Prolux PU coating is a two-component polyurethane system suitable for concrete, fibreglass, ceramic, plastic and properly prepared steel. It offers UV, abrasion and weathering resistance, which can be useful on exterior metal or plastic surfaces.

CROP 2K Fiberglass Putty is a reinforced two-component polyester filler designed for repairing cracks, dents and deeper damage on metal, aluminium and plastics. Once cured, it can be sanded smooth before priming and painting.

Why surface preparation is essential

Metal and plastic are less absorbent than concrete, so adhesion relies on a clean, sound surface. Basic preparation usually involves:

Degreasing to remove oils and release agents
Lightly abrading smooth areas to create a mechanical key
Removing rust or corrosion from metal before coating

Always check the individual product instructions, as requirements can vary between a PU coating and a polyester filler.

When this matters

This is especially relevant when a project combines different materials, such as a metal frame with plastic trim, a workshop floor with steel edging, or a repair area that includes both bodywork and plastic components. Choosing a compatible product for each surface reduces the chance of early peeling or loss of protection.

Related guides

Professional Anti Infiltration Product

For mixed-substrate work, pairing a compatible coating with a suitable repair filler creates a more complete anti-infiltration approach. The wider professional anti-infiltration range includes options for porous and non-porous surfaces, so it is worth confirming the substrate list before you buy.