How Thick Can You Pour Epoxy?
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If you're making a river table, preserving flowers, or working with a large resin mold, one question comes up fast:
How thick can you pour epoxy?
The answer depends on the type of epoxy you're using. Not every resin is made for thick pours. Coating epoxies are designed for thin layers, while deep pour epoxy is formulated to cure more slowly and handle greater depth. For Promise Deep Pour Epoxy, the recommended maximum pour depth is up to 2 inches per layer.
Why Pour Depth Matters
Epoxy cures through an exothermic reaction, which means it creates heat as the resin and hardener react. The thicker the pour and greater the volume of epoxy, the harder it is for that heat to escape. Pouring epoxy deeper than recommended can lead to:
- Excessive bubbles
- Cracking
- Shrinkage
- Discoloration
- Cure issues
- Excessive heat buildup
That's why choosing the right epoxy for the depth of your project matters.
Deep Pour Epoxy vs. Table Top Epoxy
Deep Pour and Table Top Epoxy aren't interchangeable.
Table Top Epoxy is best for:
- Tabletops
- Countertops
- Bar tops
- Thin surface coatings
Deep Pour Epoxy is better for:
- River tables
- Floral preservation
- Large molds
- Encapsulation
- Thick resin castings
An easy way to remember it: Coating a surface? Table Top. Filling significant depth? Deep Pour.
Can You Pour Epoxy in Multiple Layers?
Yes. If your project is deeper than the recommended maximum pour depth, use multiple layers instead of trying to pour everything at once. For example, if your project is more than 2 inches deep, build the depth with multiple pours of Deep Pour Epoxy.
If the previous layer has fully cured, lightly sanding and cleaning the surface before the next pour can help create a strong bond.
Does Temperature Affect Deep Pour Epoxy?
Yes. Temperature affects how quickly epoxy reacts and cures. Promise Deep Pour Epoxy is best used around 65F — 75F. Warmer temperatures generally speed up the reaction, while cooler temperatures slow it down.
Keeping your workspace, resin, and project materials within the recommended temperature range can help give you more predictable results.
Quick Tips for a Better Deep Pour
- Follow the recommended mixing ratio.
- Mix thoroughly, scraping the sides and bottom.
- Don't leave a large batch of mixed epoxy sitting in the bucket.
- Stay within the recommended pour depth.
- Seal porous wood to help reduce bubbles.
- Make sure your mold is completely leak-free.
So, How Thick Can You Pour Epoxy?
There's no single answer for every resin. For Promise Deep Pour Epoxy, you can pour up to 2 inches per layer, making it a great fit for river tables, floral preservation, large molds, and other thick casting projects.
The biggest takeaway: match the epoxy to the depth of your project and follow the recommended pour limits.
Planning a bigger pour? Shop Promise Deep Pour Epoxy.
1 comment
How about if I use a pressure pot? I have begun making epoxy/wood bowls. I am a long term wood bowl maker and I have recently made 2 epoxy bowls and 1 vase. The bowls were pine cone/epoxy combinations 4” deep and 10” wide. The vase was a colored tongue depressors and epoxy and about 8” deep and 5” wide. No cracking I had them in the pressure pot for 72 hours at 50 psi. All were made with Promise Deep Pour epoxy sanded to 240 grit and coated with Promise Table Top epoxy. Sanded to 3000 grit and buffed with epoxy polish. The finish is not as glossy as I wanted but look good.