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Mascoat® 250P is a high solids aluminum epoxy mastic primer that provides excellent corrosion protection over marginally clean substrates up to 250°F. It is intended for use under Mascoat’s insulating coatings, but can also be top-coated with epoxies and/ or polyurethanes. It is predominantly used on structural steel, steel tanks, barges, refineries, petrochem plants, power plants, railcars, pulp & paper mills, and other facilities as recommended.

Product Type: 2K (2 component) Coating, Primer, Solventless & High Solids Coating

Compatible Substrates & Surfaces: Metal, Steel

Features: Chemical Resistant, Corrosion Resistant, Good Adhesion, Good Substrate Wetting, High Flexibility, Low VOC, Water Resistant

Application Method: Brush, Roller, Spray

Chemical Family: Epoxy & Epoxy Derivatives

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Identification & Functionality

Finish
Aluminium

Features & Benefits

Features
  • Surface tolerant coating
  • Excellent corrosion protection
  • Good chemical resistance
  • Extended recoat window
  • Excellent flexibility
  • Excellent edge protection
  • Single coat capability
  • Outstanding wetting & adhesion properties
  • VOC Compliant

Applications & Uses

Application Method
Compatible Substrates & Surfaces
Limitations

Applications should not exceed 250˚F.

Substrates & Surface Protection

Remove oil & grease from the surface with solvent or a commercial cleaner, which does not leave a residue according to SSPC-SP1.

Abrasive blasting to a Commercial finish per SSPC-SP6 to obtain a 1.5–3 mil profile is preferred. For non-abrasive environments, Hand Tool cleaning per SSPC-SP 2, Power Tool cleaning per SSPC-SP 3 or high-Pressure Water cleaning per SSPC-SP12/NACE 5 WJ-4 is recommended.

Application Equipment
  • Conventional Sprayer - Industrial sprayers such as DeVilbiss MBC or JGA and Binks 18 or 62 having double regulated pressure pot, 3/8’ I.D. minimum material hose and a .070” I.D. fluid tip and air cap are recommended.
  • Airless Sprayer - Sprayer such as Graco’s Bulldog with a 30:1 ratio and a 0.017” - 0.021” tip is recommended
  • Power Mixer - Use only explosion proof power mixers
  • Brush or Roll - Use a medium brush and short nap roller with solvent resistant fibers and core.
Application Conditions
  Material Surface Ambient
Minimum 50˚F 50˚F 50˚F
Maximum 90˚F 110˚F 110˚F

Special reducing and application procedures are required outside these temperatures. Surface temperatures should be 5˚F above dew point to prevent condensation.

Mixing & Reducing
  • Mixing - Power mix each component, then blend Part B into the Part A and mix until uniform at the following ratio:
  2 Gal. Kit 10 Gal. Kit
M-250P Part A 1 gallon 5 gallon
M-250P Part B 1 gallon 5 gallon
  • Reducing - Reducing is not required for most applications; however M-250P may be reduced up to 1 pint/gal. Reducer 1 - 250 is recommended for applications temperatures below 70°F and Reducer 2 - 250 is recommended above 70°F. Reducer 2-250 is recommended for overcoating inorganic zinc primers as well as for brush and roller applications of M-250P.
  • Pot life - Four hours at 75°F. Less at higher temperatures.
Clean Up

Cleanup with Reducer 1-250 or Reducer 2-250.

Dry & Cure Times

The following minimum times are based on a 5 mil DFT and adequate air ventilation. Higher thickness and reduced air circulation increase drying times.

Surface Temperature To Touch To Handle Final Cure
50˚F 20 hours 48 hours 10 days
60˚F 10 hours 24 hours 5 days
70˚F 5 hours 12 hours 3 days
80˚F 3 hours 6 hours 2 days
90˚F 2 hours 3 hours 1 days

M-250P can be applied in a wet-on-wet manner with itself, which eliminates the dry time between coats.

M-250P has a 30-day recoat window. It is imperative to remove chalk and surface contamination prior to recoating. High-pressure washing is an acceptable method of removing chalk and surface contamination. For applications requiring longer than 30 days, please contact Mascoat for recommendations.

Properties

Physical Properties
ValueUnitsTest Method / Conditions
Cyclic Salt Fog (1000 hrs)No Blistering or RustASTM B-117
Impact Resistance (Direct)160.0in.lbsASTM D-2794
Adhesion4407.0psiASTM D-4541
Abrasion Resistance (1 kg load/1000 Cycles Weight Loss CS 17 wheel)51.0mgASTM D-4060
Component A
ValueUnitsTest Method / Conditions
Flash Point98.0°F
Typical Properties
ValueUnitsTest Method / Conditions
Reducer (Mascoat Reducer 1-250)max. 70°F
Reducer (Mascoat Reducer 2-250)min. 70°F
Volume Solids Content (Mixed)79 - 81%
Wet Film Thickness127 - 228µ/Coat
Dry Film Thickness101 - 152µ/Coat
Theoretical Dry Coat Coverage (5 mils)257.0ft²/gal
VOC Content (Unthinned)179.0g/l
VOC Content (Mascoat Reducer 1-250, 1 pint/gal)258.0g/l
VOC Content (Mascoat Reducer 2-250, 1 pint/gal)250.0g/l
Flash Point (Reducer 1-250)53.0°F
Flash Point (Reducer 2-250)113.0°F
Component B
ValueUnitsTest Method / Conditions
Flash Point133.0°F
Resistance
Exposure Immersion Splash/Spillage Fumes
Acidic Not recommended Good Good
Alkaline Not recommended Excellent Excellent
Solvents Not recommended Good Excellent
Salt water Excellent Excellent Excellent
Water Excellent Excellent Excellent

Safety & Health

Safety

For minimum protection, Mascoat recommends an N95 particulate respirator mask. For additional protection, a half mask respirator with organic vapor cartridge can be utilized. Eye protection recommended due to spray application method.

Packaging & Availability

Packaging

Packaging Unit

  2 Gal. Kit 10 Gal. Kit
M-250P Part A 1 gallon 5 gallon
M-250P Part B 1 gallon 5 gallon

Shipping Weight

  2 Gal. Kit 10 Gal. Kit
M-250P Part A 1 gallon 5 gallon
M-250P Part B 1 gallon 5 gallon

Storage & Handling

Shelf Life

2 years for both Parts A & B when stored inside at 40˚F - 110˚F.