Do You Have to Sand Between Epoxy Resin Coats?

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Is Sanding Required Between Epoxy Coats?

Achieving excellent adhesion and a flawless finish between epoxy layers is crucial for any creative or functional resin project. Many crafters and professionals wonder: do you really need to sand between coats?

Why Sanding Is Important When Layering Epoxy

If your previous epoxy layer has fully cured (hardened), a smooth and shiny surface forms that can actually hinder the next layer from bonding well. Light sanding creates a slightly roughened surface, allowing the fresh epoxy to grip properly. Skipping this step may lead to poor adhesion, visible layering lines, or even peeling between coats.

How to Sand Between Epoxy Coats

Wait until the first coat is completely cured, following the resin manufacturer’s guidelines.
Use fine-grit sandpaper (such as 320–400 grit) to gently scuff the surface. Sand evenly without applying too much pressure.
Wipe away all dust with a clean, damp cloth and ensure the surface is dry before pouring the next layer.

For even more precise results on artistic projects, consider using a specialised resin like Art Pro Deluxe, designed for accurate resin control and crisp layer definition.

When This Matters Most

If you are building up deep castings, layering large tabletops, or simply adding multiple coats for strength or aesthetics, sanding each fully cured layer is especially important. Projects with thick or high-traffic surfaces, like coasters or furniture, benefit greatly from this step to ensure long-lasting results.

Related guides

How To Apply Additional Layers To Epoxy Resin

While sanding between epoxy resin layers may add an extra step, it ensures optimal adhesion and a professional finish—key to beautiful, durable results in any multi-layer epoxy project. For more guidance on building up multiple layers, see our guide on how to apply additional layers to epoxy resin.