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Product Details

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.

Note: Not intended for clear coating applications. For clear coating applications, use TotalBoat Traditional Epoxy Resin with TotalBoat Crystal Clear Hardener.

Tech Specs
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
Info & Guides
Note: Epoxy pumps may not be compatible between brands. If using TotalBoat Hardener with an alternate brand of epoxy resin, be sure to confirm accurate mixing ratios based on the exact quantity each pump will yield.

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

10 of 12 Reviews

April 22, 2021

I would buy this Product again
By Ken from Iowa

Verified Purchase

Used it on my boat to rebuild Transom

Bottom Line Yes, I would recommend to a friend

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December 28, 2020

Great product as usual
By Wrussellwoodhaus from Southbury CT

Verified Purchase

Ordered the 5:1 mix and use it a lot for filling wood defects and inclusions dyed black mainly. Live the product.

Desk top progress
Bottom Line Yes, I would recommend to a friend

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July 15, 2020

Yes
By Tom from North Carolina

Verified Purchase

I replace transom on my boat and slow hardener give you the time needed work the glass.

Bottom Line Yes, I would recommend to a friend

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November 18, 2019

Excellent product
By Bull Hippo from Ozark , Al

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.

Bottom Line Yes, I would recommend to a friend

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December 8, 2017

Easy to use even in warm SC weather
By CBCalvin from Fountain Inn, SC, USA

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).

Payson Bolger Cartopper with TotalBoat 5:1 Epoxy
Bottom Line Yes, I would recommend to a friend

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August 2, 2017

I would and have bought this product again.
By John the Manatee Restorer from Louisiana

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.

Bottom Line Yes, I would recommend to a friend

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July 11, 2017

great product.
By Tom boat maker from Fl

Verified Purchase

just right for temps 90-75 deg. enough working time and ready to go the next day

Bottom Line Yes, I would recommend to a friend

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August 20, 2016

Great Product
By Farm Boy from Salmon, Idaho

Nice to have enough time to work larger areas.

Bottom Line Yes, I would recommend to a friend

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November 15, 2015

Great Stuff!
By DAVID M from FRANKFORT, OH

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....

Bottom Line Yes, I would recommend to a friend

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June 17, 2015

Great stuff!
By Gary L. Sr. from Saint Maries, Idaho

Verified Purchase

All good!

Bottom Line Yes, I would recommend to a friend

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