EP30
Optically clear two-part epoxy · US · manufacturer-sourced
How long does Master Bond EP30 take to cure?
Short answer
Two-part cure ladder
Pot life, set and full cure all run off the mix time
- Mix the Optically clear two-part epoxy in the exact ratio
- Work inside the pot life
- Do not load until the stated cure
This product’s stated stages Quoted at 73°F
- Working time ends25–30 minutes
- Full cure18 hours to 1 day
Worth noticing: Working time is only 25–30 minutes; the next stated stage, full cure, is 18 hours to 1 day.
Common mistake: Mixing a large batch in a warm room; the pot life is shorter than the sheet suggests.
Bond-strength path
Assembly, handling and full load are different stages
Time the epoxy cure
Your countdown
Stated times
- Working time ends25–30 minutes
- Full cure18 hours to 1 day
From Master Bond data sheet · checked 2026-10-25. Anything not listed isn’t stated by the manufacturer.
Manufacturer website: masterbond.com
Conditions & fine print
- Stated conditions: 73°F (23°C)
- Pot life and cure times shorten in warm rooms and with larger batches. Follow the current data sheet and mixing instructions.
- Region US. Formulas can differ between countries; check your container.
- Working time ends: The guide's set-up time column is used for this time. Confirm working life on the product's own data sheet.
- Full cure: At room temperature.
- 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 Report outdated information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
- Master Bond EP30
- Variant
- Optically clear two-part epoxy
- Region
- US
- Listed use
- optics, clear bonding, potting
- Timed stages recorded
- tooling, full cure
- Source checked
- 2026-10-25
Documentation: Technical data sheet · Selector guide, undated
Condition attached to the stated time: The guide's set-up time column is used for this time. Confirm working life on the product's own data sheet.
About this product
An optically clear epoxy with a set-up time of just 25 to 30 minutes and a cure of 18 to 24 hours at room temperature, shorter than EP21LV by about half a day. The guide lists a heat cure of 1 to 2 hours at 200°F.
Using this specific product
Master Bond EP30 is listed here as the Optically clear two-part epoxy version for optics, clear bonding, and potting. For mixing and curing epoxy, 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 Optically clear two-part epoxy; related versions can use different timing.
- For optics, clear bonding, and potting, pay particular attention to mix ratio, batch size, temperature and pour thickness.
- The guide's set-up time column is used for this time. Confirm working life on the product's own data sheet. At room temperature.
How to check readiness
Check the coolest or thickest part for firmness before sanding, demolding or loading. The selector guide lists a set-up time of 25 to 30 minutes at room temperature. Reserve full cure for demanding use, chemicals, washing, immersion or load—not merely gentle handling.
Avoid this mistake
A larger batch can heat faster while a thin film may cure more slowly.
Compare with similar products
- Compare with Loctite (Henkel) Repair Putty All-PurposeFull cure: 1 day there, 18 h to 1 day here.
- Compare with Sikafloor-2650Full cure: 8 h there, 18 h to 1 day here.
Questions
How long does this product take to cure?
Master Bond states: The selector guide lists a set-up time of 25 to 30 minutes at room temperature. Conditions: The guide's set-up time column is used for this time. Confirm working life on the product's own data sheet.. The selector guide lists a room-temperature cure of 18 to 24 hours. Conditions: At room temperature.. These are the manufacturer’s stated times, not a guarantee.
How much faster is EP30 than EP21LV?
On the selector guide EP30 sets up in 25 to 30 minutes against 60 to 90 for EP21LV, and cures in 18 to 24 hours against 24 to 48.
How long do I have to work with this product?
Master Bond states: The selector guide lists a set-up time of 25 to 30 minutes at room temperature. Conditions: The guide's set-up time column is used for this time. Confirm working life on the product's own data sheet.. 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 times shorten in warm rooms and with larger batches. Follow the current data sheet and mixing instructions. Follow the product label for your conditions.