Smooth-On EpoxAcast 690
Deep-pour clear epoxy · US · not yet reviewed
How long before you can demold Smooth-On EpoxAcast 690?
Short answer
Project stage ladder
Demolding, handling, finishing and final use may occur at different times
For maker resin, identify which stage the stated to demold 1 day milestone actually unlocks. Earlier handling does not prove final cure.
Calculate the next project stage
Stated times
- Ready to demold1 day
- Full cure7 days
From manufacturer source · checked 2026-10-25.
Conditions & fine print
Drying time can change with temperature, humidity, film thickness and surface conditions.
Using this specific product
Smooth-On EpoxAcast 690 is listed here as the Deep-pour clear epoxy version for maker resin. 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 Deep-pour clear epoxy; related versions can use different timing.
- For maker resin, pay particular attention to accurate mixing, mold material, mass and room temperature.
- At manufacturer-stated conditions; temperature, humidity and film thickness can change drying time.
How to check readiness
Check the casting itself for flex or tack before demolding. Confirm the surface is dry and ready before continuing. 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.
Questions
How long does this product take to dry?
Demold after approximately 24 hours. Allow 7 days for full cure. Times vary with temperature, humidity, thickness and surface conditions.
What affects this product dry time?
Drying time can change with temperature, humidity, film thickness and surface conditions.