Should You Sand Between Epoxy Resin Coats?

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Achieving a sleek, long-lasting epoxy finish on a speargun isn’t just about application—surface prep between coats is key. Let’s explore whether sanding is necessary between coats and how it affects your results.

Why Sand Between Coats of Epoxy?

Sanding between coats ensures each new layer of epoxy resin adheres securely to the one beneath, especially once the previous layer has fully cured. Without sanding, the surface may become too smooth and glossy, which can prevent adequate bonding and leave you with a less robust finish. Light sanding also removes minor imperfections and dust, helping deliver a smoother feel and appearance.

How to Sand Epoxy Resin Safely

Once your first coat has fully cured and is no longer tacky, carefully sand using fine-grit sandpaper (typically 320–400 grit). Wipe away sanding residue with a clean, dry cloth before proceeding with the next coat. If working with detailed surfaces, consider tools like the Tooth Shaped Spatula for Epoxy Resin Application to help minimise irregularities during each layer.

When This Matters Most

If your epoxy has cured past the recommended re-coat window (often within 24 hours), sanding becomes even more crucial. Preparing the surface enhances mechanical adhesion, ensuring durability—important for spearguns that face exposure to water or physical stress.

Related products

• "EpoxyWood" – Wood Restoration Epoxy Resin for Deep Penetration and Waterproofing
• "Art Pro" – Clear Epoxy Resin for Artists and Surface Coating
• Tooth Shaped Spatula for Epoxy Resin Application

Related guides

• How Do You Apply Epoxy Resin To A Speargun

A bit of care between coats—especially sanding—can give your speargun a flawless, lasting epoxy finish. For more on choosing and using the best epoxy products, visit our main guide: How do you apply epoxy resin to a speargun?.