TotalBoat 5:1 Slow Hardener Group Size A
TotalBoat TotalBoat by Jamestown Distributors
  • TotalBoat 5:1 Slow Hardener Group Size A
  • TotalBoat 5:1 Slow Hardener Group Size B
  • TotalBoat 5:1 Slow Hardener Group Size C

TotalBoat 5:1 Slow Hardener

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.

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Tech Spec Product Info User Generated Content
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.

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 

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

BRAND: TotalBoat
Material: Epoxy
Rate Of Cure: Slow
Type: Hardener
4.9 9

Excellent product


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.

Bull Hippo

Ozark , Al


Easy to use even in warm SC weather


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).


Fountain Inn, SC, USA


I would and have bought this product again.


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.

John the Manatee Restorer



great product.


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

Tom boat maker



Great Product


Nice to have enough time to work larger areas.

Farm Boy

Salmon, Idaho


Great Stuff!


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....




Great stuff!


All good!

Gary L. Sr.

Saint Maries, Idaho


Great Hardener just wish there was more


Mixed, using the 5:1 System, works Great. My only trouble, I end up with a least a + Quart of Resin. Wish you Hardener size would be 36 ozs. I usually mix using the measured containers with the 5:1 system equaling 8 ozs. and, as stated, end up with + Quart of Resin left.




when they say slow believe it!


I just built a Michelak Larsboat tandem kayak using this epoxy system. I needed some more epoxy and was going to get some MAS epoxy as I had used it before. While In the store I saw the total boat and decided to try it as the price was much better. The guy at the counter said fast hardener might be too fast for me, I found slow to take forever. I had to keep scraping the runs off for what seemed like e half hour after each seam was wet out. If you live where it hits 100 degrees for more than a few hours a year, or work in the hot sun, slow might work for you. If you build in a nice cool new england basement, get the fast hardener. For those runs that you hate, and redoing fiberglass epoxy or paint on a wooden boat, get the Wagner paint eater, I've used it to redo runny seams and repaint boats. It takes epoxy, paint and fiberglass off, but won't touch the wood unless you hold it there for long after the paint is gone. I could still read my pencil marks just like the hull had never been painted.


north shore MA


5:1 Slow Hardener



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