Carboline

Carbomastic 15

Aluminum epoxy mastic, 5 to 7 mil · US · manufacturer-sourced

Check your container: This countdown is for the Aluminum epoxy mastic, 5 to 7 mil variant. Similar-looking versions may have different times.

How long before you can recoat Carboline Carbomastic 15?

Short answer

Ready for another coat: 1 day after application.
Safe to touch: 5 hours after application.
Industrial protective coatings

Film-build schedule

Recoat has a floor and a ceiling, and film thickness moves both

  1. Prepare the surface and apply the Aluminum epoxy mastic, 5 to 7 mil to the stated thickness
  2. Recoat inside the window the data sheet gives
  3. Return to service only at the stated cure

This product’s stated stages Quoted at 75°F

  • Safe to touch5 hours
  • Ready for another coat1 day
  • Immersion-ready5 days

Worth noticing: Safe to touch at 5 hours; immersion-ready at 5 days.

Common mistake: Recoating after the maximum window has closed; the next coat may not bond without abrading.

Industrial protective coatings

Coat timeline

Plan the next coat and final use separately

  1. 1
    ApplyUse the Aluminum epoxy mastic, 5 to 7 mil directions and prepare for steel coating and tank service.
  2. 2
    Next coatUse the listed recoat milestone; do not substitute touch-dry time.
  3. 3
    Normal useWait for the applicable handling, water or cure milestone.

Check the recoat window

When did this coat go on?
Conditions that affect drying
Where?
Thickness

Stated times

  • Safe to touch5 hours
  • Ready for another coat1 day
  • Immersion-ready5 days

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 2 hours at 75°F and 1 hour at 90°F.
  • Ready for another coat: It is 5 days at 10°C, 3 days at 16°C and 18 hours at 32°C.
  • Immersion-ready: It is 15 days at 10°C, 10 days at 16°C and 3 days at 32°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 Report outdated information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
Carboline Carbomastic 15
Variant
Aluminum epoxy mastic, 5 to 7 mil
Region
US
Listed use
steel coating, tank service
Timed stages recorded
touch, recoat min, immersion
Source checked
2026-10-25

Documentation: Technical data sheet · Product data sheet, Jul 2017

Condition attached to the stated time: Pot life is 2 hours at 75°F and 1 hour at 90°F.

About this product

A thick-film mastic where cold is expensive: recoat takes 5 days at 10°C but 18 hours at 32°C, and immersion cure runs 15 days down to 3. Pot life is just 2 hours at 75°F.

Using this specific product

Carboline Carbomastic 15 is listed here as the Aluminum epoxy mastic, 5 to 7 mil version for steel coating and tank service. 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 Aluminum epoxy mastic, 5 to 7 mil; related versions can use different timing.
  • For steel coating and tank service, pay particular attention to surface preparation, film thickness, temperature, dew point and pot life.
  • Pot life is 2 hours at 75°F and 1 hour at 90°F. It is 5 days at 10°C, 3 days at 16°C and 18 hours at 32°C. It is 15 days at 10°C, 10 days at 16°C and 3 days at 32°C.

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. Before recoating, confirm the first coat matches the manufacturer’s stated condition; if the maximum window passed, check whether sanding is required. Continuous immersion is more demanding than splashes; wait for the specific immersion milestone.

Avoid this mistake

Recoat windows can close; past the maximum, abrading is usually required.

Compare with similar products

Keep going

Questions

How long before you can recoat this product?

Carboline states: The sheet gives touch dry at 5 hours at 75°F. Conditions: Pot life is 2 hours at 75°F and 1 hour at 90°F.. The sheet gives recoating after 24 hours at 24°C (75°F). Conditions: It is 5 days at 10°C, 3 days at 16°C and 18 hours at 32°C.. The sheet gives an immersion cure of 5 days at 24°C. Conditions: It is 15 days at 10°C, 10 days at 16°C and 3 days at 32°C.. These are the manufacturer’s stated times, not a guarantee.

How much does cold slow Carbomastic 15 recoating?

A lot. The sheet gives 5 days at 10°C against 24 hours at 24°C and 18 hours at 32°C.

How long before this product can be immersed in water?

Carboline states: The sheet gives an immersion cure of 5 days at 24°C. Conditions: It is 15 days at 10°C, 10 days at 16°C and 3 days at 32°C.. These are the manufacturer’s stated times, not a guarantee.

How long until this product is safe to touch?

Carboline states: The sheet gives touch dry at 5 hours at 75°F. Conditions: Pot life is 2 hours at 75°F and 1 hour at 90°F.. 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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