Free shipping on orders over $99.99! Don't miss out!

This item is eligible for free shipping on orders over $99.99

Product Details

MAS Epoxy medium hardener is a polyamine blend intended for moderate activity and resistance to blushing. Moderate pot life gel and thin film set times provide advantages when filleting and fairing.

MAS Epoxy Medium mixes with thickeners, gel and sets quickly enough to avoid draining and sagging, while still allowing ample flow time for controlled application periods.

This hardener is a good choice when overnight sandability is more important than continuous laminating and open time. Won't 'milk out' during application or fog up in critical clear coating applications.

Available in Pint, Quart, Half Gallon, Gallon, 4 Gallon, and 5 Gallon sizes.

Info & Guides
    Technical Specifications
  • Viscosity at 77 degrees F: 200 cp unmixed, 410 cp mixed
  • Specific Gravity at 77 degrees F: .0998
  • Flash Point (closed cup): 234 degrees F
  • Mix Ratio: 2:1 Resin to Hardener
  • Mixed Viscosity at 77 degrees F: 400-500 cps
  • Pot Life at 77 degrees F: 12 minutes
  • Thin Film Set Time at 77 degrees F: 3 hours
  • Full Cure: 5 days
  • Peak Exotherm at 77 degrees: 340
  • Peak Exotherm Time: 15 minutes
    • Performance
  • Tensile Strength: 7,350 psi
  • Tensile Modulus: 395,000 psi
  • Use protective gloves when working with this product. Use soap and water or white vinegar to clean your hands. Use Denatured Alcohol to clean your tools.

    Reviews for MAS Medium Epoxy Hardener

    4 of 4 Reviews

    November 20, 2020

    MAS Epoxy the best
    By CATELENA from Delaware

    Verified Purchase

    GREAT product easy to work with building a hard top for my boat !

    Hard top balsa core
    Bottom Line Yes, I would recommend to a friend

    Was this review helpful to you?

    March 28, 2014

    "Excellent customer service!"
    By Kurt from crystal lake, Illinois

    Verified Purchase

    The product is what it is......it is hardener and is messy but very effective. I am taking this survey because the customer service was outstanding!! The fellow (and i wish i could remember his name had a sense of humor which lightened the situation). If you have his name, thank him for an outstanding job! Kurt Humm

    Bottom Line Yes, I would recommend to a friend

    Was this review helpful to you?

    December 11, 2011

    MAS Epoxy
    By Bill from Cape Cod

    I'm now working on building my fourth boat using MAS epoxy. The two CLC kayaks from 2000 are still going strong and the Beachpea I just finished looks and sails great. I used the MAS on a set of 8' Pete Culler oars as well as using it to repair my 60 year old Thistle. I've never had an epoxy joint fail.

    Bottom Line Yes, I would recommend to a friend

    Was this review helpful to you?

    March 3, 2010

    Consistant set up time
    By Catman from WI

    Provides good open work time

    Bottom Line Yes, I would recommend to a friend

    Was this review helpful to you?