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TotalBoat 5:1 Slow Hardener is a low-viscosity epoxy curing agent for use when extended working and cure time is needed or to provide adequate working time at higher temperatures. Use with both TotalBoat 5:1 Epoxy Resin and all traditional 5:1 epoxy brands.
At 75°F, our Slow Hardener will have a pot life of 20 minutes. When combined with TotalBoat 5:1 Epoxy Resin in a five-part resin to one-part hardener ratio, the cured resin/hardener mixture yields a rigid, high-strength, moisture-resistant solid with excellent bonding and coating properties.
Important: Not intended for clear coating applications. For clear coating applications, we recommend TotalBoat High Performance Epoxy.
Note: TotalBoat 5:1 Slow Hardener is also available in a 10.4 gallon container, for use with 55 gallon drums of 5:1 resin. Please contact us for pricing.
| Hardener Color | Amber (not intended for clear coating) |
|---|---|
| Mix Ratio by Volume | 5A to 1B |
| Mix Ratio by Weight | 100A to 18B |
| Minimum Recommended Temperature | 60°F |
| Pot Life at 75° F | 20 minutes |
| Work Life at 75° F (Thin Film) | 90 minutes |
| Set Time at 75° F (Thin Film) | 10 hours |
| Cure Time at 75° F (Thin Film) | 1 to 4 days |
| Tensile Strength | 7,500 psi |
| Tensile Modulus | 460,000 psi |
| Tensile Elongation | 4.5% |
| Compressive Strength | 11,500 psi |
| Flexural Strength | 12,000 psi |
| Flexural Modulus | 450,000 psi |
| Volumetric Shrinkage | 4.4% |
| Hardness, Shore D | 83 |
For a side-by-side comparison of the physical and handling properties of TotalBoat Fast and Slow Hardeners, please click the 5:1 Epoxy Resin & Hardeners Tech Data link.
Important Safety Information
Always wear protective clothing and equipment to protect your eyes, skin, and lungs when working with TotalBoat Traditional Epoxy Resin and Hardeners. Personal protective clothing should include appropriate gloves, safety glasses or goggles, a proper respirator, and a proper apron or similar protective clothing.
WARNING: The TotalBoat 5:1 Epoxy Slow Hardener can expose you to chemicals including bisphenol A, which is known to the State of California to cause female reproductive toxicity. For more information, go to www.P65Warnings.ca.gov
Reviews for TotalBoat 5:1 Slow Hardener
February 10, 2022
Verified Purchase
Slow hardener works well especially when you are a newbie like me. Only trouble I had was no matter how careful I was about mixing the correct amounts I never have enough hardener for the amount of resin. I did not use the pump supplied in the kit as one of the straws to lengthen the pump was missing. Instead, I used the graduations on the mixing cups allowing time for the resin and hardener to settle out.
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April 22, 2021
Verified Purchase
Used it on my boat to rebuild Transom
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December 28, 2020
Verified Purchase
Ordered the 5:1 mix and use it a lot for filling wood defects and inclusions dyed black mainly. Live the product.
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July 15, 2020
Verified Purchase
I replace transom on my boat and slow hardener give you the time needed work the glass.
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November 18, 2019
Verified Purchase
Total Boat epoxy compares to West Marine epoxies . I find no difference between the two except for the price. Use this at the correct temp range and you will be happy.
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December 8, 2017
As a first-time 'glasser, I was concerned that it would be too warm and the resin would set before it was spread and smooth. TotalBoat 5:1 Slow Hardner performed as described in TotalBoat Product Guide giving me plenty of working time even though the temperature was over 80 (in October).
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August 2, 2017
Bought fast hardener first but found I wasn't that fast on the application. This made a huge difference with the pot time. Works great. I highly recommend it.
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July 11, 2017
Verified Purchase
just right for temps 90-75 deg. enough working time and ready to go the next day
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August 20, 2016
Nice to have enough time to work larger areas.
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November 15, 2015
Verified Purchase
Used 5:1 Total Boat to replace Transom in a 14' Monark, 1974, that I am restoring. Purchased the Gallon size kits several times, works well. Easy to use and easy to shape and sand. My only wish, is that the Hardener was larger in size. I use that 5:1 ratio and always run out of Hardener before the Resin... Approximately 2 quarts of Resin left....
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