Mold Max 20
Tin-cure silicone · US · manufacturer-sourced
How long before you can demold Smooth-On Mold Max 20?
Short answer
Cast-and-demold plan
Gel, demold and full cure are separate days
- Mix the Tin-cure silicone to ratio and pour
- Wait for the demold time
- Sand or finish after full cure
This product’s stated stages Quoted at 73°F
- Working time ends45 minutes
- Demold16 hours
- Full cure1 day
Worth noticing: Working time is only 45 minutes; the next stated stage, demold, is 16 hours.
Common mistake: Demolding early and leaving a soft, tacky casting that never fully hardens.
Project stage ladder
Demolding, handling, finishing and final use may occur at different times
For mold making and silicone mold, identify which stage the stated to demold 16 hours milestone actually unlocks. Earlier handling does not prove final cure.
Time demold and cure
Your countdown
Stated times
- Working time ends45 minutes
- Ready to demold16 hours
- Full cure1 day
From Smooth-On data sheet · checked 2026-10-25. Anything not listed isn’t stated by the manufacturer.
Manufacturer website: smooth-on.com
Conditions & fine print
- Stated conditions: 73°F (23°C)
- Pot life and cure time shorten in warm rooms and with bigger batches. Follow the current technical bulletin for mix ratio, mixing and release agents.
- Region US. Formulas can differ between countries; check your container.
- Working time ends: At 73°F (23°C).
- Ready to demold: At room temperature.
- Full cure: At 73°F (23°C).
- Entered from the cited manufacturer documentation. Check the current label for the exact formula and region. Report outdated information
- Actual results depend on preparation, thickness, ventilation, temperature, humidity, mixing and substrate.
Confirm this is your product
Closely named formulas, colors and regional versions can use different times. Match these details to your container before starting a countdown.
- Exact listing
- Smooth-On Mold Max 20
- Variant
- Tin-cure silicone
- Region
- US
- Listed use
- mold making, silicone mold
- Timed stages recorded
- tooling, demold, full cure
- Source checked
- 2026-10-25
Documentation: Technical data sheet · TB code 120723DH
Condition attached to the stated time: At 73°F (23°C).
About this product
Mold Max 20 is a maker & casting resin product from Smooth-On, listed for mold making, silicone mold. Its times are stated under: At 73°F (23°C). This page tracks 3 stated steps, from working time at 45 minutes to full cure at 1 day.
Using this specific product
Smooth-On Mold Max 20 is listed here as the Tin-cure silicone version for mold making and silicone mold. For casting resin, the useful question is not simply whether the surface looks finished—it is whether the exact next-action milestone shown above has been reached.
Before you start
- Confirm the package says Tin-cure silicone; related versions can use different timing.
- For mold making and silicone mold, pay particular attention to accurate mixing, mold material, mass and room temperature.
- At 73°F (23°C). At room temperature.
How to check readiness
Check the casting itself for flex or tack before demolding. The technical bulletin gives a pot life of 45 minutes. Flex the mold away at one edge and stop if the casting bends, tears or remains tacky. Reserve full cure for demanding use, chemicals, washing, immersion or load—not merely gentle handling.
Avoid this mistake
Demold time is not necessarily full mechanical cure.
Compare with similar products
- Compare with Alumilite Amazing Clear Cast PlusDemold: 1 day to 2 days there, 16 h here.
- Compare with EcoPoxy FlowCastDemold: 3 days there, 16 h here.
Questions
How long before you can demold this product?
Smooth-On states: The technical bulletin gives a pot life of 45 minutes. Conditions: At 73°F (23°C).. The technical bulletin says to allow the mold to cure overnight (at least 16 hours) before demolding. Conditions: At room temperature.. The technical bulletin gives a cure time of 24 hours. Conditions: At 73°F (23°C).. These are the manufacturer’s stated times, not a guarantee.
How does Mold Max 20 compare with other maker & casting resin products?
Smooth-On states 16 hours for demold, which is slower than the typical maker & casting resin product here (median 5 hours across 95 products). The quickest listed is Smooth-On Mold Star 14T at 9 minutes; the slowest is Smooth-On Crystal Clear 204 at 2 days.
Is there a faster Smooth-On maker & casting resin option?
Yes. Among the 94 Smooth-On maker & casting resin products listed here, Smooth-On Mold Star 14T states a shorter demold time (9 minutes versus 16 hours).
What conditions do the stated times for Mold Max 20 assume?
Stated conditions: At 73°F (23°C); At room temperature. Baseline temperature: 73°F. Cooler, damper or thicker applications usually take longer.
How long does this product take to fully cure?
Smooth-On states: The technical bulletin gives a cure time of 24 hours. Conditions: At 73°F (23°C).. These are the manufacturer’s stated times, not a guarantee.
How long do I have to work with this product?
Smooth-On states: The technical bulletin gives a pot life of 45 minutes. Conditions: At 73°F (23°C).. These are the manufacturer’s stated times, not a guarantee.
What affects how long this product takes to dry or cure?
Pot life and cure time shorten in warm rooms and with bigger batches. Follow the current technical bulletin for mix ratio, mixing and release agents. Follow the product label for your conditions.