Carbomastic 94 MC
Mastic coating for prepared steel · US · manufacturer-sourced
How long before you can recoat Carboline Carbomastic 94 MC?
Short answer
All stated times for Carbomastic 94 MC
| Milestone | Time | Condition |
|---|---|---|
| Safe to touch | 6 hours | Pot life is 4 hours at 77°F and the induction time is 15 minutes. |
| Recoat window closes | 365 days | Clean and dull the surface if it has weathered. |
| Ready for another coat | 18 hours | The sheet allows recoating for up to a year. |
Source: Product data sheet, Oct 2018.
Film-build schedule
Recoat has a floor and a ceiling, and film thickness moves both
- Prepare the surface and apply the Mastic coating for prepared steel to the stated thickness
- Recoat inside the window the data sheet gives
- Return to service only at the stated cure
This product’s stated stages Quoted at 75°F
- Safe to touch6 hours
- Ready for another coat18 hours
- Recoat window closes365 days
Worth noticing: Recoat inside the window: not before 18 hours and not after 365 days.
Common mistake: Recoating after the maximum window has closed; the next coat may not bond without abrading.
Coat timeline
Plan the next coat and final use separately
- 1ApplyUse the Mastic coating for prepared steel directions and prepare for steel maintenance coating and recoating.
- 2Next coatUse the listed recoat milestone; do not substitute touch-dry time.
- 3Normal useWait for the applicable handling, water or cure milestone.
Check the recoat window
Your countdown
Stated times
- Safe to touch6 hours
- Recoat window closes365 days
- Ready for another coat18 hours
From Carboline data sheet · checked 2026-10-25. Anything not listed isn’t stated by the manufacturer.
Manufacturer website: carboline.com
Conditions & fine print
- Stated conditions: 75°F (24°C)
- Protective-coating times are for the stated film thickness, temperature and humidity. Cold steel, thick films and poor airflow lengthen them. Follow the current data sheet.
- Region US. Formulas can differ between countries; check your container.
- Safe to touch: Pot life is 4 hours at 77°F and the induction time is 15 minutes.
- Recoat window closes: Clean and dull the surface if it has weathered.
- Ready for another coat: The sheet allows recoating for up to a year.
- 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 Report outdated information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
- Carboline Carbomastic 94 MC
- Variant
- Mastic coating for prepared steel
- Region
- US
- Listed use
- steel maintenance coating, recoating
- Timed stages recorded
- touch, recoat max, recoat min
- Source checked
- 2026-10-25
Documentation: Technical data sheet · Product data sheet, Oct 2018
Condition attached to the stated time: Pot life is 4 hours at 77°F and the induction time is 15 minutes.
About this product
A mastic coating where the useful number is the long recoat window: you can wait 18 hours at 75°F or come back up to a year later. The pot life is only 4 hours and there is a 15 minute induction time after mixing.
Using this specific product
Carboline Carbomastic 94 MC is listed here as the Mastic coating for prepared steel version for steel maintenance coating and recoating. For coating steel or industrial surfaces, 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 Mastic coating for prepared steel; related versions can use different timing.
- For steel maintenance coating and recoating, pay particular attention to surface preparation, film thickness, temperature, dew point and pot life.
- Pot life is 4 hours at 77°F and the induction time is 15 minutes. Clean and dull the surface if it has weathered. The sheet allows recoating for up to a year.
How to check readiness
Check dry film thickness and the recoat window before the next coat. Touch only a hidden edge first; a dry surface can conceal a soft layer underneath. The sheet allows the recoat window to stay open for up to one year. Before recoating, confirm the first coat matches the manufacturer’s stated condition; if the maximum window passed, check whether sanding is required.
Avoid this mistake
Recoat windows can close; past the maximum, abrading is usually required.
Compare with similar products
- Compare with Hempel Hempinol 10220Recoat: 16 h there, 18 h here.
- Compare with Nippon Paint EA4 FinishRecoat: 16 h there, 18 h here.
Questions
How long before you can recoat this product?
Carboline states: The sheet gives touch dry at 6 hours at 75°F. Conditions: Pot life is 4 hours at 77°F and the induction time is 15 minutes.. The sheet allows the recoat window to stay open for up to one year. Conditions: Clean and dull the surface if it has weathered.. The sheet gives recoating after 18 hours at 75°F. Conditions: The sheet allows recoating for up to a year.. These are the manufacturer’s stated times, not a guarantee.
How long can Carbomastic 94 MC wait before the next coat?
The sheet gives a minimum of 18 hours at 75°F and a window of up to one year.
How long until this product is safe to touch?
Carboline states: The sheet gives touch dry at 6 hours at 75°F. Conditions: Pot life is 4 hours at 77°F and the induction time is 15 minutes.. These are the manufacturer’s stated times, not a guarantee.
What affects how long this product takes to dry or cure?
Protective-coating times are for the stated film thickness, temperature and humidity. Cold steel, thick films and poor airflow lengthen them. Follow the current data sheet. Follow the product label for your conditions.
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