Epoxy Resin Types Explained: Coating, Casting, Deep Pour and Flower Preservation
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Epoxy resins are formulated for different jobs. Choosing by the word “epoxy” alone can lead to uneven coatings, trapped bubbles or overheating. Check the intended application, viscosity, maximum pour depth, batch size, working time and cure schedule for the exact product.
Common epoxy resin categories
| Type | Typical use | Key checks |
|---|---|---|
| Coating resin | Thin surface layers and glossy finishes | Recommended coating thickness and levelling instructions |
| Casting resin | Moulds, decorative objects and thicker shapes within limits | Mould compatibility, viscosity and maximum depth |
| Deep-pour resin | Thicker pours where the formulation is designed for them | Specified pour depth, batch size and cure conditions |
| Flower-preservation resin | Preserving suitably dried flowers in keepsakes | Clarity, working time, casting depth and flower preparation |
How to choose for your project
- Trays and clocks: decide whether the resin is a thin topcoat or a thicker cast, then select a product rated for that depth.
- Small jewellery moulds: consider fine detail, viscosity, pot life and the mould cavity size.
- Large or deep castings: use a product explicitly rated for the intended depth and batch size. Do not assume ordinary casting resin can be poured deeply.
- Flower keepsakes: dry flowers fully and choose a suitable resin for the block dimensions and layering plan.
Explore ArtOrnate resin and the guides to coating vs casting resin and deep-pour resin.
Ratio is not the only specification
A 2:1 or 3:1 ratio is a mixing instruction, not a measure of quality or a guarantee of depth suitability. Confirm whether the ratio is by weight or volume, which component is listed first and how long to mix. See the 2:1 vs 3:1 guide.
Working time and cure time
Pot life describes how long a mixed batch remains workable under stated conditions. It is not the same as demould time or full cure. Temperature, batch size and product chemistry affect results. Do not demould early just because the surface feels firm. Read working time vs cure time.
Common selection mistakes
- Using coating resin for a thick pour without checking depth limits.
- Assuming all clear epoxy resins behave the same.
- Choosing only by ratio or pot life.
- Ignoring mould material, ambient conditions or inclusion moisture.
- Skipping small test pours before an expensive project.
Frequently asked questions
Can I use coating resin in a deep mould?
Only if the product instructions explicitly allow the depth and batch size. Otherwise choose a suitable casting system.
Is deep-pour resin always slower?
Working and curing times vary by formulation; check the product specification rather than assuming.
What is best for flower preservation?
Choose based on the block size, flower preparation, clarity, viscosity and maximum pour depth.
How do I avoid a failed cure?
Measure with the specified ratio and units, mix thoroughly, control the work conditions and allow the full cure time.
Related: mixing epoxy resin and resin tools.
Compare technical data before buying
For two candidate resins, compare intended application, maximum pour depth, recommended batch size, viscosity, pot life, recoat window and full cure time. Also check the permitted working temperature and the types of inclusions or colourants allowed. A product with a longer working time is not automatically suitable for a deeper pour, and a clear appearance does not prove that a resin is rated for a large casting.
Make a test piece
When changing resin type, make a small test with the same mould material, pigment and inclusion you plan to use. Let it reach full cure before judging clarity, hardness and release. Browse ArtOrnate resin options and compare the specific product instructions rather than selecting by the category name alone.
Use a decision checklist
Before ordering, write down the project type, approximate dimensions, maximum resin depth, required clarity, inclusions and time available for the pour. Compare those needs with the product's technical data. If a specification is unclear, ask the supplier rather than inferring performance from a product name, ratio or photograph.
Why small tests save time
A small test can reveal whether the resin wets a mould properly, releases cleanly, works with the pigment and reaches the expected finish. Let the test cure fully before deciding whether it is suitable. This is especially helpful when changing between coating, casting and deep-pour products, because each formulation is designed around different performance limits.