Non-Blushing Slow Hardener
$32.75$162.70 Select options

Non-Blushing Slow Hardener


Slow Hardener is a 2:1 non-blushing hardener. It can be paired with our LV Resin or FLAG Resin and mixed with the 2:1 Medium Hardener and/or Fast Hardener, making it one of the most versatile epoxy hardeners on the market.  You get more time than with other supplier’s “Slow Hardeners” so it’s easier to work with in high temperatures and for beginners.  Slow Hardener gives you strength, beauty and a four-hour working time.

(1 customer review)


  • No messy wash downs due to non-blushing properties
  • Easily laminates large areas of fiberglass or carbon cloth when paired with Slow Hardener
  • Ideal for saturation coating because of self-leveling properties
  • Low viscosity is compatible with vacuum bagging applications
  • Excellent sealant when used without fiberglass or carbon cloth
  • Clear finish means you get the structure and finish you want with one product


Safety Data Sheet

Slow Hardener


How much will I need?

What are the dimensions of your project?
Here is the amount of epoxy resin you will need


Questions and answers of the customers

  1. 0 votes
    Answered by the admin

    The time will vary on a few different factors, typically once you can no longer make a fingernail impression in the epoxy you can sand but it may become soft as the friction generates heat. In normal conditions you can sand after 24 hours. If you notice the paper gumming up with epoxy, let it cure for another 4-6 hours and revisit. 

  2. 0 votes
    Q Can I use this product when the temperature is 55 degrees? answer now
    Asked by Rick Herman on October 24, 2020 4:04 pm
    Answered by the admin

    he recommended minimum temperature for clear coating and laminating is 55-60°F, but for bonding anything above 45°F should be sufficient.  A chalky white appearance can happen when epoxy coatings have been allowed to gel below the recommended minimum temp.  30-65% relative humidity is ideal for manufacturing, but the MAS 2:1 Epoxy System is not as sensitive to ambient moisture as some other products.  Just be mindful not to let the curing epoxy come in direct contact with moisture while it is gelling, i.e. rain and dew.  Be sure to keep containers tightly sealed when not in use to protect material from moisture contamination during storage.   

    A chalky white appearance can happen when epoxy coatings have been allowed to cure in temperatures below the recommended minimum temp of 55-60°F.  You may be able to turn the coating clear again by heating the area up with a space heater or heat gun, but more than likely you will have to sand off the chalky epoxy and recoat if you want the coating to be clear.  Potential failures down the road of the opaque coating could be a reduced life span and lower overall mechanical properties of the epoxy.   

    For best results, all materials and working conditions should be maintained at a constant 70°F-80°F. Epoxy is a temperature sensitive material.  When cool, it’s thicker and sets slower.  When warm, it’s thinner and sets faster.  When working in conditions or with material below 70°F, epoxy may become to viscous to properly release air and self level.  Working in conditions or with material above 80°F, it may set too quickly and exotherm, become too hot, which could cause it to yellow, distort or crack. 

  3. 0 votes
    Answered by the admin

    It should take around 5-7 days to reach its full physical and mechanical properties. 

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1 review for Non-Blushing Slow Hardener

  1. Kat Cornelius (verified owner)

    Ok! This is a great product! However, the bottle says you have a 30 minute working time while this description says 4 hours. I def recommend but be aware that this mix will be tacky and hot within 30 minutes and completely cured/dry within 1 to 2 hours.

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