Deep Pour Epoxy: The Complete Guide to Thick Pours, Cure Times, and Avoiding Mistakes

Deep pour epoxy makes river tables, thick molds, and large castings possible — without pouring the same piece a dozen times. If you’re planning a river table, an encapsulation mold, or any project where you need genuine depth in resin, this guide covers everything: what deep pour epoxy is, how thick you can pour, how long it takes to cure, and what causes the mistakes that ruin pours before they finish.

We’ll walk through Superclear’s two deep pour formulas — Liquid Glass Deep Pour and 24 Hour Liquid Glass — the specs behind them, and the techniques that get you a crystal-clear result every time.

What Is Deep Pour Epoxy?

Deep pour epoxy is a slow-curing, low-exotherm two-part casting resin designed for pours of 2–4 inches in a single application. Unlike table-top coating resins, which max out at about 1/4 inch per coat, deep pour formulas generate less heat during curing — which prevents the exothermic cracking and cloudiness that kills thick pours. The tradeoff is time: deep pour epoxy takes longer to gel and demold than a standard coating, but you build real depth in a single pour instead of dozens of flood coats.

Key Takeaways

• Superclear’s Liquid Glass Deep Pour can be cast 2–4 inches deep in a single pour.
• The 24 Hour Liquid Glass variant cures faster but maxes at 1 inch per layer.
• Gel time for Liquid Glass Deep Pour runs 10–12 hours; you can demold in 48–72 hours.
• Full cure and maximum hardness take 30 days on both products — plan delivery around that, not demold time.
• The working temperature window is 70–84°F; temperature is the single biggest driver of your result.
• The most common failures — cloudiness, sticky spots, cracking — all trace to mixing errors or overrunning pour depth.

How Thick Can You Pour Deep Pour Epoxy?

Superclear’s Liquid Glass Deep Pour can be poured 2–4 inches in a single application — that’s the entire depth range most river table channels and deep mold projects need. That ceiling isn’t arbitrary. It reflects the product’s low-exotherm chemistry and the thermal dynamics of curing resin at those depths.

The Exotherm Problem — and Why It Sets the Limit

When epoxy cures, it generates heat. Thin pours dissipate heat quickly because the surface-area-to-volume ratio is high. Thick pours trap heat, which can accelerate cure, cause yellowing, introduce cloudiness, or crack the casting. Liquid Glass Deep Pour is specifically formulated to manage heat at 2–4 inches. Exceeding 4 inches in a single pour pushes the thermal limits of the formula, and you’ll pay for it with a compromised casting.

The 24 Hour Liquid Glass works differently: it cures faster (hence the name) but caps at 1 inch per layer. It’s the right choice for smaller projects that need a quicker turnaround — charcuterie boards, serving trays, small art castings. For a river table, you want Liquid Glass Deep Pour.

Pouring Multiple Layers

If your project needs more than 4 inches of total depth, you pour in layers. The timing matters: pour the second layer while the first is in a gel-but-tacky state — typically 24–36 hours in — and the two layers will chemically bond without needing any surface prep. If the first layer has fully hardened before you add more, sand the surface to 80–120 grit first to create mechanical adhesion.

There’s no absolute cap on total depth when building in layers — the limit is per pour, not per project.

Deep Pour Epoxy Cure Times: What to Expect

Liquid Glass Deep Pour gels in 10–12 hours, can be carefully demolded at 48–72 hours, and hits full cure and maximum hardness at 30 days. It’s hard to the touch within 24 hours — but hard to the touch is not the same as fully cured.

That distinction matters for scheduling. A river table you can demold in 3 days isn’t a table you can deliver in 3 days. Furniture-grade hardness, the ability to sand without scratching, and the surface’s resistance to impressions all develop over the full 30-day cure. We’ve seen builders rush delivery and pay for it with surface marks the client can’t overlook.

Why Temperature Controls Everything

At 70–84°F, Liquid Glass Deep Pour performs as designed: crystal-clear, bubble-free, and on schedule. Drop below 65°F and cure slows dramatically — you can end up with a permanently tacky surface. Push above 85°F and the cure accelerates unevenly, introducing cloudiness or cracks.

If you’re in a garage shop in winter, heat the space before and during the pour — not just at pour time. The resin and the wood both need to be at working temperature. Cold wood on a concrete floor can drop the surface temperature enough to affect the cure even when the air reads 72°F.

24 Hour Liquid Glass Cure Schedule

24 Hour Liquid Glass gels in 18–20 hours and can be demolded at 24–36 hours. Full cure and maximum hardness are still 30 days. The faster surface-dry makes it practical for smaller pieces where you’re building up layers quickly — but don’t mistake “cures fast” for “fully cured fast.” Both products reach full strength at 30 days.

What Goes Wrong With Deep Pour Epoxy (and How to Fix It)

The most common deep pour failures are cloudy or hazy resin from mixing problems, soft or tacky spots from ratio errors, and cracking from pours that run too hot. All three are preventable once you know where they start.

Cloudiness and Hazing

Cloudiness after a deep pour almost always comes from one of three things: moisture (pouring on damp wood or in high humidity), temperature shock (cold wood meeting warm resin), or under-mixing. Under-mixing is the easiest to prevent and the most common cause we see.

When you mix, you’re combining Part A and Part B thoroughly — but “thoroughly” has a specific definition. Stir slowly and deliberately for 3–5 minutes minimum, scraping the sides and bottom of the bucket with a silicone spatula. Then transfer to a second clean container and mix again for 2 more minutes. This double-bucket method catches the unmixed resin clinging to the original container walls — that’s the batch most likely to stay cloudy.

Soft or Tacky Spots

Sticky spots after cure are almost always a ratio problem or an incomplete mix. Liquid Glass Deep Pour mixes at 2:1 by volume (100 parts Part A to 44 parts Part B by weight). Getting the ratio wrong by even 10% leaves unreacted hardener or resin in the mix, and it’ll never fully cure.

One rule: don’t scrape the mixing container when you pour. The last bit on the walls and bottom didn’t mix evenly — pour cleanly and leave the residue behind.

Cracking

Cracking in a deep cast means the exotherm ran too hot — typically from too much volume in a closed mold, from working at the high end of the temperature range, or from the mold material trapping heat. More volume cures quicker because the mass retains heat; the larger the pour, the more important it is to stay at the low end of the depth range and give extra time between layers.

If you’re in a warm shop (80°F+) and pouring near the 4-inch max, consider splitting it into two 2-inch pours rather than one.

Getting the Best Result: Mixing, Temperature, and Prep

Crystal-clear, bubble-free deep pours come down to four things: correct ratio, temperature, mixing technique, and surface prep. Nail all four and the resin does the rest.

Ratio and Mixing Technique

Mix Liquid Glass Deep Pour at 2:1 by volume (100 parts Part A to 44 parts Part B by weight). Measure in graduated mixing cups or on a scale — both work. Don’t eyeball it. Stir for at least 3–5 minutes, scraping sides and bottom, then transfer to a second clean container for another 2 minutes of mixing. This is the double-bucket rule, and it’s worth following every time.

Surface bubbles rise during the pour and can be broken with a heat gun held 6–8 inches above the surface, moving in slow even passes. Don’t linger in one spot — you’re popping bubbles, not warming the resin.

Seal Porous Wood First

Porous wood outgasses air as the resin warms and cures. That outgassing creates bubbles trapped in your pour. The fix is straightforward: seal any porous surfaces — end grain, voids, bark edges, knot holes — with a thin brush-on coat of Table Top Epoxy 1:1 before pouring Liquid Glass. Let it cure, sand lightly, and then pour. It adds a day, but it eliminates the air source entirely.

Mold Prep

Melamine-faced particleboard sealed with tuck tape is the standard mold material — resin doesn’t bond to either. Seal any gaps at wood-to-form or form-to-form seams with silicone before pouring. A small gap at the bottom of a 4-inch pour means losing the entire casting.

Liquid Glass Deep Pour vs. 24 Hour Liquid Glass: Which One?

	Liquid Glass Deep Pour	24 Hour Liquid Glass
Mix ratio	2:1 by volume (100:44 by weight)	2:1 by volume (100:43 by weight)
Max depth per pour	2–4 inches	1 inch per layer
Gel time	10–12 hours	18–20 hours
Demold	48–72 hours	24–36 hours
Full cure / max hardness	30 days	30 days
Best for	River tables, large molds, deep castings	Smaller castings, charcuterie boards, faster layering

Both are zero-VOC and formulated to meet FDA guidelines for indirect food contact once fully cured. The right one depends on your project’s depth and schedule — not on which is inherently better.

Frequently Asked Questions

How long does deep pour epoxy take to cure?

Liquid Glass Deep Pour gels in 10–12 hours and can be carefully demolded after 48–72 hours. It’s hard to the touch within 24 hours, but full cure and maximum hardness take 30 days. Don’t sand for a final finish or put the piece into service before the 30-day mark if you want the best result.

Can I pour deep pour epoxy in multiple layers?

Yes — pour the second layer while the first is still in a gel-but-tacky state (typically 24–36 hours after the initial pour) and the layers will chemically bond. If the first layer has fully hardened, sand to 80–120 grit before adding the next pour. There’s no maximum total depth when building in layers; the 2–4 inch limit is per single pour.

What’s the difference between deep pour epoxy and table top epoxy?

Deep pour epoxy (like Liquid Glass) is a 2:1 casting resin formulated for pours of 2–4 inches in a single application. Table Top Epoxy is a 1:1 coating resin for surfaces — it maxes at about 1/4 inch per pour and self-levels into a thin, high-gloss finish. They’re chemically different formulas for completely different applications. Don’t substitute one for the other.

What temperature do you need for deep pour epoxy?

Keep both the workspace and your materials at 70–84°F during the pour and throughout the cure. Below 65°F, cure slows significantly and may produce a permanently tacky surface. Above 85°F, cure accelerates unevenly and can cause cloudiness or cracking. Both the resin and the wood need to be at working temperature — not just the air in the room.

Can deep pour epoxy be used outdoors?

We don’t recommend pouring outdoors — temperature control is critical and direct sun can heat a mold unevenly. For outdoor furniture finished with deep pour, bring the piece indoors for the pour and the full cure, then move it outside once it’s at full hardness. Cured Liquid Glass is UV resistant and heat resistant, so it holds up well once it’s finished.

Go Deeper

For the step-by-step process of building a river table — mold construction, wood prep, and the full pour workflow — see our Deep Pour Epoxy Beginner’s Guide. If you’re still deciding between deep pour and a table-top coating, Deep Pour vs. Table Top Epoxy covers the choice directly. And for the specific question of how depth per layer varies by product, How Deep Can You Pour Epoxy? has the per-product breakdown.

Ready to Pour?

Liquid Glass Deep Pour and 24 Hour Liquid Glass are available direct from Superclear — the manufacturer. No middlemen, consistent small-batch quality, and real technical support when a pour goes sideways.

• Liquid Glass Deep Pour Epoxy Casting Resin 2:1 — river tables, deep molds, and large castings
• 24 Hour Liquid Glass Deep Pour Epoxy 2:1 — smaller projects and faster turnaround

Questions about your specific project? Call us at 888-849-0588 or email superclear@fgci.com (Mon–Fri, 8:30am–5pm ET). We make the resin — we’ve seen every pour scenario, and we’ll help you get it right.