Can Acidic Metals Be Used in Epoxy Resin?

Reactive Metals and Epoxy Resin: What to Know

Metals like copper, brass, and bronze can react with their environment, which sometimes leads to gradual tarnishing or discolouration within clear epoxy. This is especially true in resin art, jewellery, or deep pour projects with visible metal features. Over time, exposure to air or the slight acidity in resins may affect the metal’s appearance.

How to Prevent Discolouration

The best way to maintain the original shine of reactive metals is to seal them before embedding. A spray or brush-on clear acrylic lacquer forms a barrier that prevents the resin from direct contact with the metal. Apply the lacquer thoroughly, allow it to cure, and ensure no missed spots for full protection. Once dry, proceed with your project using a suitable resin such as “Trasparente” Multipurpose Clear Epoxy Resin for castings up to 2cm or “Liquidissima” for jewellery.

Practical Steps for Embedding Metal

• Clean the metal surface to remove oils or residue.
• Seal with a thin, even coat of clear lacquer and let it dry thoroughly.
• Test-fit your piece in the mould, making any adjustments before pouring resin.
• Choose a slow-curing, bubble-resistant resin for best clarity and finish.