Carboline Carbomastic 615


We no longer stock this product; please contact our technical team on 0113 2455450 (option 2) or send a message to [email protected] where we will be happy to find an alternative product.

Carboline Carbomastic 615 is a two-component, high performance epoxy that has excellent resistance to fresh and salt water exposures. This coating exhibits outstanding moisture and surface tolerance during application, low temperature cure capability, and very fast cure response for quick return to service. 

Suitable for immersion service in fresh or salt water after 60 minute cure @24°C.

  • High solids, low VOC
  • Low temperature cure
  • Excellent wetting properties
  • Excellent surface tolerance
  • Excellent moisture tolerance on application
  • Fast cure response
  • Semi-gloss finish

Product not available
This Product has been Discontinued


Carboline Carbomastic 615 is a two-component, aluminium-pigmented, low temperature curing mastic designed for cold weather applications down to -18°C. This unique coating provides excellent corrosion resistance over existing finishes and rusted or SSPC-SP2 or SP3- cleaned steel.

Carbomastic 615 is ideal for industrial or heavy duty marine environments for the protection of steel against salt-laden environments.

Suitable for immersion service in fresh or salt water after 60 minute cure @24°C.

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Features and Benefits

  • High solids, low VOC
  • Low temperature cure
  • Excellent wetting properties
  • Excellent surface tolerance
  • Excellent moisture tolerance on application
  • Fast cure response
  • Semi-gloss finish

Product Specification

Technical Data
Carboline Carbomastic 615
Volume Solids: 80% +/- 2%
Theoretical Coverage Rate: 31.5 m²/l at 25 microns
6.3 m²/l at 125 microns
3.1 m²/l at 250 microns
Allow for loss in mixing and application
Dry Film Thickness: 127 - 254 microns per coat
Dry Temperature Resistance: Continuous: 93°C
Non-Continuous: 121°C
Wet Temperature Resistance:

Immersion temperature resistance depends upon the exposure

Contact Rawlins on  Tech - 0113 2455450 (option 2) or [email protected] for specific information

Topcoats: May be coated with acrylics, epoxies, alkyds, or polyurethanes
Limitations: Epoxies lose gloss, discolour, and eventually chalk in sunlight exposure
Flash Point: Part A: 43°C
Part B: 32°C
Mixed: 39°C
Thinner 2: -5°C
Shelf Life: Part A: 24 months 23°C
Part B: 24 months 23°C
Storage Temperature and Humidity: 4°C - 38°C
0-95% Relative Humidity

Drying Times

Curing Schedule
Surface Temp. Dry to Topcoat Minimum Maximum Recoat Time Minimum Cure for Immersion Service
-7°C 72 Hours 45 Days 7 Days
2°C 2 Days 30 Days 5 Days
16°C 8 Hours 15 Days 3 Hours
24°C 2 Hours 7 Days 1 Hour
32°C 90 Minutes 3 Days 1 Hour

  • These times are based on a 125 micron dry film thickness. Higher film thickness, insufficient ventilation or cooler temperatures will require longer cure times and could result in solvent entrapment and premature failure
  • Excessive humidity or condensation on the surface during curing can interfere with the cure, can cause discolouration and may result in a surface haze. Any haze or blush must be removed by water washing before recoating
  • Recoat intervals may vary from those listed above when using under intumescent fireproofing products
  • Consult Rawlins on Tech - 0113 2455450 (option 2) or [email protected] for recommended cure times before applying Carboline intumescent products
  • If the maximum recoat times have been exceeded, the surface must be abraded by sweep blasting or sanding prior to the application of additional coats
  • For force curing, contact Rawlins for specific requirements

Surface Preparation


  • Surfaces must be clean and dry
  • Employ adequate methods to remove dirt, dust, oil and all other contaminants that could interfere with adhesion of the coating in accordance with SSPC-SP 1 and follow the guidelines below


  • Immersion: NACE No. 2/SSPC-SP 10 with a 2.0-3.0 mil (50-75 microns) surface profile
  • Non-Immersion: NACE No. 3/SSPC-SP 6 with a 2.0-3.0 mil (50-75 microns) surface profile for maximum protection. SSPC-SP 2, SSPC-SP 3, NACE No. 4/SSPC-SP 7, NACE/SSPC WJ-1 to WJ-4, or SSPC-SP 14 are also acceptable methods. For alternate methods contact Rawlins on Tech - 0113 2455450 (option 2) or [email protected] 
  • When using under fireproofing products, defer to the primer surface preparation requirements in the product data sheet of the fireproofing product


  • Concrete shall be designed, placed, cured, and prepared in accordance with NACE No. 6/SSPCSP 13, latest edition.
  • Abrade to remove all laitance, loose concrete, etc. and to create surface profile in accordance with ICRI CSP standards for the coating system

Stainless Steel

  • SSPC-SP 16: for immersion service create 38 to 75 microns anchor profile

Application Methods

Product Information
Mixing: Mix separately, then combine and mix in the following proportions:

1 Gallon Kit 

  • Part A: 0.8 Gallon
  • Part B: 0.2 Gallons

5 Gallon Kit

  • Part A: 4 Gallons
  • Part B: 1 Gallon
Thinning: Thin up to 12% by volume with Carboline Thinner 2
Ratio: 4:1 (Part A to Part B)
Pot Life: 1½ hours at 24°C and less at higher temperatures
Pot life ends when coating becomes too viscous to use
Spray Application (General) Hold gun 12-14 inches from the surface and at a right angle to the surface
Conventional Spray Pressure pot equipped with dual regulators, 3/8” I.D. minimum material hose, .070” I.D. fluid tip and appropriate air cap
Airless Spray: Pump Ratio: 30:1 min
Volume Output: 2.5 gpm min.
Material Hose: 3/8” I.D. min
Tip Size: 0.017-0.021”
Output PSI: 2000-2500 psi
1/2" minimum I.D. material hose recommended. May use 3/8" for some setups
Brush and Roller: Not recommended for tank lining applications except when striping welds
For non-immersion applications over damp surfaces, brush and roller is the preferred method
Multiple coats may be required to obtain desired appearance, recommended dry film thickness and adequate hiding
Avoid excessive re-brushing or re-rolling. For best results, tie-in within 10 minutes at 24°C
Thin up to 11% by volume per gallon with Carboline Thinner 2. Use a short-nap synthetic roller cover with phenolic core

Application Conditions

Product Conditions
Condition Material Surface Ambient Humidity
Minimum 7°C -7°C -7°C 0%
Maximum 32°C 49°C 38°C 95%

  • Industry standards are for substrate temperatures to be above the dew point
  • For immersion conditions it is recommended to follow this procedure
  • For non-immersion conditions Carbomastic 615 can tolerate damp substrates
  • Special thinning and application techniques may be required above or below normal conditions
  • Do not apply to substrates with ice or ice crystal formation
  • Dehumidify or raise the temperature to eliminate ice on the substrate

Health and Safety

Clean Up

  • Use Thinner 2 or Acetone
  • In case of spillage, absorb and dispose of in accordance with local applicable regulations


  • Read and follow all caution statements on this product data sheet and on the safety data sheet for this product
  • Employ normal workmanlike safety precautions


  • When used as a tank lining or in enclosed areas, thorough air circulation must be used during and after application until the coating is cured
  • The ventilation system should be capable of preventing the solvent vapor concentration from reaching the lower explosion limit for the solvents used
  • In addition to ensuring proper ventilation, appropriate respirators must be used by all application personnel
  • User should test and monitor exposure levels to ensure all personnel are below guidelines. If not sure or if not able to monitor levels, use MSHA/NIOSH approved supplied air respirator


  • This product contains flammable solvents
  • Keep away from sparks and open flames
  • Refer to the product and safety data sheet in the attachments section above for further details
Product Details

Data sheet

Water / Solvent Based
For Use On
Steel, Concrete
Application Method
Standard / Ready Mixed
Single, Two or Three Pack
Mixing Ratio
4:1 (Part A to Part B)
31.5 m²/l at 25 microns - 6.3 m²/l at 125 microns - 3.1 m²/l at 250 microns
Recommended Thinner/Cleaner
Carboline Thinner 2
Compatible Topcoats
May be coated with acrylics, epoxies, alkyds, or polyurethanes
Max. Application Temperature
Material: 32°C - Surface: 49°C - Ambient: 38°C - Humidity: 95%
Min. Application Temperature
Material: 7°C - Surface: -7°C - Ambient: -7°C - Humidity: 0%
Solids by Volume
80% +/- 2%
Shelf Life (from date of manufacture)
Part A: 24 months 23°C - Part B: 24 months 23°C
Dry for Topcoat (at +20°C)
2 Hours @ 24°C
Recommended Dry Film Thickness
127 - 254 microns per coat
UN Number
Pot Life
1½ hours at 24°C

Customer agrees that before placing an Order, Customer has read and understood the most up to date Product Data Sheet for the Product. Where we have access to the Product Data Sheet from the manufacturer, we will either provide a copy on request, or include a link to the Product Data Sheet available on the manufacturer’s website. Customer further agrees that we have no liability for any errors or omissions contained within the Product Data Sheets. For more information, please see our Terms & Conditions of Sale.

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