What is the Difference Between Release Films and Primers?

Release Films: Preventing Adhesion for Easy Demoulding

Release films, such as the “Shiny Shield” – Glossy Release Film for Resin Projects, are designed to prevent epoxy resin from sticking to surfaces. This property makes them ideal for lining moulds or frames during casting. Once your resin cures, the release film allows for straightforward separation, leaving behind a glossy, polished finish.

• Best for use inside resin moulds, frames, and formwork
• Speeds up project clean-up—no sanding or effort scraping resin from your tools
• Particularly useful when you want to achieve a smooth, mirror-like finish with minimal finishing work

Primers: Promoting Adhesion for Lasting Results

Primers, like the “Epoxyprimer” Universal Water-Based Two-Component Epoxy Floor Primer, do the exact opposite. They are applied to surfaces such as concrete, timber, screeds, or tiles to encourage strong bonding with epoxy resin layers. By improving adhesion, primers help prevent issues like peeling, lifting, or uneven coverage—especially important for flooring projects and large resin builds.

• Great for preparing floors or surfaces that might otherwise resist resin
• Eco-friendly, odourless formulations are suitable for interior use
• Ensure to follow recommended curing times before applying resin overlays

When Should You Use Each?

Select a release film whenever you want easy removal and a high-gloss finish for your resin work—such as river tables, clear panels, or detailed art pieces. Choose a primer if your aim is for the resin to permanently adhere to a substrate, which is the case with durable floor coatings or bonding resin to wood, tile, or concrete surfaces.