Free Form AIR FAST
Epoxy putty · US · manufacturer-sourced
How long before you can demold Smooth-On Free Form AIR FAST?
Short answer
Cast-and-demold plan
Gel, demold and full cure are separate days
- Mix the Epoxy putty 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 ends6–10 minutes
- Demold1 day
Worth noticing: Working time is only 6–10 minutes; the next stated stage, demold, is 1 day.
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 quick sculpting, repairs, and putty, identify which stage the stated to demold 1 day milestone actually unlocks. Earlier handling does not prove final cure.
Time demold and cure
Your countdown
Stated times
- Working time ends6–10 minutes
- Ready to demold1 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. The chart is a summary.
- Region US. Formulas can differ between countries; check your container.
- Working time ends: Pot life depends on the thickness mixed.
- Ready to demold: 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 Report outdated information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 Free Form AIR FAST
- Variant
- Epoxy putty
- Region
- US
- Listed use
- quick sculpting, repairs, putty
- Timed stages recorded
- tooling, demold
- Source checked
- 2026-10-25
Documentation: Technical data sheet · Technical Data Chart (no revision date)
Condition attached to the stated time: Pot life depends on the thickness mixed.
About this product
A fast epoxy putty. The chart ties pot life to the thickness of the mix: 6 minutes at 1.5 in., 8 at 3/8 in. and 10 at 1/8 in., then a 24 hour cure.
Using this specific product
Smooth-On Free Form AIR FAST is listed here as the Epoxy putty version for quick sculpting, repairs, and putty. 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 Epoxy putty; related versions can use different timing.
- For quick sculpting, repairs, and putty, pay particular attention to accurate mixing, mold material, mass and room temperature.
- Pot life depends on the thickness mixed. At 73°F (23°C).
How to check readiness
Check the casting itself for flex or tack before demolding. The technical data chart gives a pot life of 6 minutes at 1.5 in., 8 minutes at 3/8 in. and 10 minutes at 1/8 in. Flex the mold away at one edge and stop if the casting bends, tears or remains tacky.
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, 1 day here.
- Compare with EcoPoxy FlowCastDemold: 3 days there, 1 day here.
Questions
How long before you can demold this product?
Smooth-On states: The technical data chart gives a pot life of 6 minutes at 1.5 in., 8 minutes at 3/8 in. and 10 minutes at 1/8 in. Conditions: Pot life depends on the thickness mixed.. The technical data chart gives a cure time of 24 hours. Conditions: At 73°F (23°C).. These are the manufacturer’s stated times, not a guarantee.
Why does Free Form AIR FAST list three pot lives?
The chart gives one for each thickness: 6 minutes at 1.5 in., 8 minutes at 3/8 in. and 10 minutes at 1/8 in. A thick mass heats up and gels sooner.
How long do I have to work with this product?
Smooth-On states: The technical data chart gives a pot life of 6 minutes at 1.5 in., 8 minutes at 3/8 in. and 10 minutes at 1/8 in. Conditions: Pot life depends on the thickness mixed.. 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. The chart is a summary. Follow the product label for your conditions.