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When planning a resin project, it’s easy to overlook the fact that not all of your carefully measured resin will end up exactly where you want it. Surfaces can soak up some resin, and excess may run off edges or get trapped in corners. Factoring in a small margin for material loss helps to ensure a flawless finish without running short mid-project.
Why Does Material Loss Happen?
Absorption occurs when surfaces like raw wood, porous stone, or unsealed substrates draw resin into their pores. Runoff refers to resin that slips past the project’s boundaries or collects beneath it—especially common with poured or river table projects. Even formwork or tape can capture a little product. Combined, these losses can mean you use slightly more resin than the basic surface area calculation suggests.
How Much Extra Resin Should You Allow?
A general guideline is to prepare 5–10% extra resin for most projects. The exact amount depends on the material’s porosity and the complexity of your piece. Highly absorbent woods, live edges, and intricate moulds may require a higher margin. Tools such as a Precision Digital Scale and Graduated Measuring Cup help you accurately manage these calculations and mix only what you need, minimising both waste and frustration.
Practical Steps to Reduce Material Loss
- Seal porous surfaces with a thin layer of resin before your main pour to minimise soak-in.
- Check your mould or formwork for leaks and use quality silicone sealant where needed.
- Mix in batches – for complex or textured projects, it may be best to pour in stages, checking absorption as you go.
When This Matters Most
It’s especially important to factor in absorption and runoff when working with live edge tables, casting over timber with bark, or filling gaps and cracks. If your project uses premium resin or covers a large surface, a careful calculation ensures you don’t pause mid-pour to mix more—risking colour or finish inconsistency.
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By accounting for absorption and runoff, you can confidently measure and mix your resin, ensuring great results every time. For a deeper dive into precise calculations for any project, visit our main resin calculation guide.