24 Hour Liquid Glass Deep Pour Review: Current Limits and Cure Timing

Superclear 24 Hour Liquid Glass Deep Pour is a distinct 2:1 casting epoxy for small to medium pours from 1/4 inch to 1 inch per layer. It is not the same product as standard Liquid Glass Deep Pour, which is formulated for thicker, slower castings.

The name needs careful interpretation: current manufacturer documents do not support a universal promise of full cure in 24 hours. This research-based review separates gel, demold, cure, and full-cure milestones and evaluates the product within its published depth and batch limits. We have not purchased or poured it.

Quick Verdict

24 Hour Liquid Glass fills a useful middle ground between a thin tabletop coating and a slow 2- to 4-inch deep-pour formula. Its documented 1/4- to 1-inch range suits shallow castings, voids, and smaller resin-and-wood features where standard deep-pour epoxy would be unnecessarily slow.

Its biggest limitation is scale. Superclear’s instructions say not to mix more than two quarts per pour, even though larger kits are sold. A 3-gallon kit is inventory for multiple batches, not permission to mix or cast three gallons at once. Large river-table pours should use a system documented for their geometry and mass.

Current Product Identity

The historical article identified Fiberglass Coatings’ “Deep Pour 24-Hour Epoxy Resin Kit,” a 1½-gallon kit, 2:1 proportions, and a one-inch pour limit. Fiberglass Coatings now markets the same distinct product through Superclear as 24 Hour Liquid Glass Deep Pour Epoxy 2:1. Current .75-, 1.5-, and 3-gallon kits preserve the historical size relationship.

This is not a rename of standard Liquid Glass. Both products remain in the current lineup with different depth and cure profiles.

Current Documented Specifications

The stable mixing instruction is 2:1 by volume. Because current first-party documents differ by one part in their weight ratio, use the ratio printed on the supplied containers rather than an old web article.

What “24 Hour” Actually Means

The product is positioned as a faster deep-pour system, but cure language varies among Superclear documents. The 2021 TDS lists an 18–24 hour gel time and 36–48 hour cure. Newer comparison guidance lists 24–36 hours to demold and 30 days to full cure.

Those are not interchangeable events:

• Gel means the mixture has advanced beyond free-flowing liquid.
• Demold means the casting may be firm enough to remove under the manufacturer’s stated conditions.
• Cure in a data table may describe a handling or functional milestone.
• Full cure is the longer period needed for final properties.

Temperature, layer depth, mixed mass, mold material, and project geometry can change every milestone. Do not schedule finishing or service solely from the product name.

Pour Depth and Batch Size Work Together

Superclear’s current family guide gives 1/4 inch as the minimum and 1 inch as the maximum per layer for this formula. The product instructions also impose a two-quart maximum mixed amount per pour.

Both limits matter because epoxy generates heat as it cures. A large reactive mass can retain excessive heat even when its nominal depth appears acceptable. Conversely, a very thin, low-mass layer may shed the heat a casting formula depends on and cure more slowly than expected.

This makes 24 Hour Liquid Glass most suitable for planned small/medium molds, shallow resin features, void fills, and layers that remain inside both boundaries. For a family-level selection answer, see how thin you can pour Liquid Glass epoxy.

Mixing and Application Requirements

The manufacturer instructions call for bringing the resin, hardener, workpiece, mold, and room to at least 70°F. Measure at 2:1 by volume, mix for six minutes while scraping the container, transfer to a clean container, and mix for another three minutes.

That nine-minute procedure is not a published liquid working-time guarantee. The TDS supplies a gel result for a controlled 100 g sample, not a universal time during which a larger bucket remains safe or easily placeable. Prepare the mold and inclusions first and place the material promptly after the prescribed mix.

For subsequent layers, follow the current instructions’ recoat window. If a layer has advanced beyond the chemical-bond stage, the manufacturer calls for mechanical preparation before recoating. Do not assume a glossy cured layer will accept another pour without preparation.

Project Fit

Good Candidates

• Small to medium castings between 1/4 and 1 inch per layer
• Shallow river or void features that stay below the two-quart batch limit
• Encapsulation and decorative castings within the documented temperature range
• Multi-layer projects where a faster recoat/demold cycle is more valuable than a very deep single pour

Choose Something Else When

• The project needs a flood coat thinner than 1/4 inch
• A single layer exceeds 1 inch
• The pour requires more than two mixed quarts at once
• The shop, mold, or materials cannot remain within the specified temperature conditions
• A very large river-table casting needs the slower heat management of standard Liquid Glass or another documented large-volume system

Our best deep-pour epoxy comparison covers category selection. The FlowCast review and TotalBoat Fathom review show why “deep pour” does not represent one universal depth or batch size.

Clarity and UV Claims

Superclear describes the product as water-clear and says it contains UV/yellowing inhibitors. Its retail page also uses comparative “highest UV protection” language. The public sources reviewed do not provide a named competitor test, exposure standard, duration, or comparative dataset. Treat this as a manufacturer positioning claim, not evidence of permanent clarity or category-leading performance.

No clear epoxy is immune to color change under every exposure. Pigments, wood, inclusions, heat, and service environment can also affect the finished appearance.

Safety and Documentation

Read the current SDS for both components. The published SDS classifies the uncured resin and hardener as hazardous materials with skin, eye, inhalation, and sensitization considerations. Use its specified engineering controls and personal protective equipment; marketing phrases such as “odor free” or “zero VOC” do not replace hazard communication.

Large mixed masses can become dangerously exothermic. Respect the two-quart limit, do not leave mixed material concentrated in a bucket, and follow the current instructions for handling, spills, storage, and disposal.

Final Assessment

24 Hour Liquid Glass is a current, identifiable niche casting system—not generic Liquid Glass and not a promise of universal 24-hour full cure. It is a sensible candidate for 1/4- to 1-inch small/medium pours when the two-quart batch limit, 2:1 volume ratio, temperature requirements, and longer full-cure schedule fit the project.

For thin flood coats, select the appropriate Superclear coating formula. For thick or high-volume casting, use standard Liquid Glass or another system whose documentation covers that mass. The purchase decision should be based on geometry and schedule, not the fastest number in the product name.

Sources

• Superclear 24 Hour Liquid Glass product page — current identity, positioning, sizes, and one-inch limit.
• 24 Hour Liquid Glass TDS — ratio, viscosity, gel, cure, and reference temperature.
• 24 Hour Deep Pour instructions — mixing, temperature, depth, batch, and layering requirements.
• Superclear depth-selection guide — current minimum/maximum depths across the product family.
• 24 Hour Liquid Glass SDS — resin and hardener hazards, controls, and handling requirements.