Skip to content Skip to navigation menu
Live Chat

WEST SYSTEM
#205 Fast Hardener

Get the working time you need for the temperature and conditions you’re working in. #205 Fast Hardener, mixed at a 5:1 ratio with #105 resin, results in a pot life of 9-12 minutes at 72°F, with solid cure in 6-8 hours. It has a minimum recommended working temperature of 40°F.

Mixing WEST SYSTEM resins and hardeners at the correct ratio requires the use of a pump kit, sold separately. For hardeners #205 (Fast) and #206 (Slow) in Group Sizes A, B and C, select the #300 Mini Pump Kit, Model 3405669. For larger group sizes of #205 and #206, use the “Model A” #306-25, Model 335703.

Mix Ratio, Resin: Hardener 5:1 by weight or volume*
Pot life at 72°F (22°C) 9 to 12 minutes
Cure to a solid state 6 to 8 hours
Cure to maximum strength 1 to 4 days
Minimum recommended temperature 40°F (4°C)
Pumps required 300, 306-25
Product Models
Description WM Model # MFG Part # Availability Price Quantity  
#205-A Fast Hardener, 0.44pt. 318360 205-A
In stock online.

$22.99

#205-B Fast Hardener, 0.86qt. 318378 205-B
In stock online.

$49.99

#205-C Fast Hardener, 0.94gal. 323741 205-C
In stock online.

$159.99

#205-E Fast Hardener, 11.31gal. 326108 205-E
In stock online.

$1,199.99

Product Description

Get the working time you need for the temperature and conditions you’re working in. #205 Fast Hardener, mixed at a 5:1 ratio with #105 resin, results in a pot life of 9-12 minutes at 72°F, with solid cure in 6-8 hours. It has a minimum recommended working temperature of 40°F.

Mixing WEST SYSTEM resins and hardeners at the correct ratio requires the use of a pump kit, sold separately. For hardeners #205 (Fast) and #206 (Slow) in Group Sizes A, B and C, select the #300 Mini Pump Kit, Model 3405669. For larger group sizes of #205 and #206, use the “Model A” #306-25, Model 335703.

Mix Ratio, Resin: Hardener 5:1 by weight or volume*
Pot life at 72°F (22°C) 9 to 12 minutes
Cure to a solid state 6 to 8 hours
Cure to maximum strength 1 to 4 days
Minimum recommended temperature 40°F (4°C)
Pumps required 300, 306-25

Specs

REVIEW SNAPSHOT®

by PowerReviews
West System#205 Fast Hardener
 
4.7

(based on 10 reviews)

Ratings Distribution

  • 5 Stars

     

    (7)

  • 4 Stars

     

    (3)

  • 3 Stars

     

    (0)

  • 2 Stars

     

    (0)

  • 1 Stars

     

    (0)

100%

of respondents would recommend this to a friend.

Pros

  • Easy to use (9)
  • Protects well (8)
  • Weather proof (7)
  • Visually pleasing (5)

Cons

No Cons

Best Uses

  • Outdoors (5)
  • Indoor (4)
  • Quick fix (4)
  • Wood trim (3)
    • Reviewer Profile:
    • Casual/ recreational (4), Advanced (3)
    • Was this a gift?:
    • No (4)

Reviewed by 10 customers

Displaying reviews 1-10

Back to top

 
5.0

happy customer

By josh

from brooklyn ny

About Me Casual/ Recreational

Verified Buyer

Pros

  • Easy to Use
  • Protects Well
  • Visually Pleasing
  • Weather Proof

Cons

    Best Uses

    • Outdoor
    • Quick Fix
    • Wood Trim

    Comments about #205 Fast Hardener:

    great results

    • Was this a gift?:
    • No
     
    5.0

    Great for cooler weather, yet still had good working time

    By fourwhitesocks

    from La Salle, Mi

    About Me Casual/ Recreational

    Verified Buyer

    Pros

    • Easy to Use

    Cons

      Best Uses

        Comments about #205 Fast Hardener:

        Filling holes for rebedding sailboat deck hardware

         
        4.0

        Yes

        By None

        from Corunna mi 48817

        About Me Advanced

        Verified Buyer

        Pros

        • Easy to Use
        • Protects Well
        • Visually Pleasing
        • Weather Proof

        Cons

          Best Uses

          • Indoor

          Comments about #205 Fast Hardener:

          Working on boats& cars

          Service and delivery comments:

          Yes

          • Was this a gift?:
          • No
           
          5.0

          work

          By dust

          from 49620

          Verified Buyer

          Comments about #205 Fast Hardener:

          Just good stuff

           
          5.0

          205-B

          By Jim

          from Hubert, NC

          About Me Casual/ Recreational

          Verified Buyer

          Pros

          • Easy to Use
          • Protects Well
          • Visually Pleasing
          • Weather Proof

          Cons

            Best Uses

              Comments about #205 Fast Hardener:

              Performs awesomely when mixed with 105 Resin.

              • Was this a gift?:
              • No
               
              4.0

              Not to bad

              By Kyle

              from Marthas Vineyard

              About Me Advanced

              Verified Buyer

              Pros

              • Easy to Use
              • Protects Well
              • Weather Proof
              • Works Well

              Cons

              • Costly
              • Messy

              Best Uses

              • Outdoor

              Comments about #205 Fast Hardener:

              Used to replace the floor in my boat.

              • Was this a gift?:
              • No
               
              4.0

              Go West young man..

              By Robert

              from South Lake Tahoe, Ca.

              About Me Professional

              Verified Buyer

              Pros

              • Easy to Use
              • Protects Well
              • Visually Pleasing
              • Weather Proof

              Cons

                Best Uses

                • Engine
                • Indoor
                • Outdoor
                • Quick Fix
                • Wood Trim

                Comments about #205 Fast Hardener:

                If you have never invested in the "west System" you are missing out on an amazing product line. I will NEVER be without my west; I still find new and wonderful uses after 20 years. One of my all time favorites is drilling a hole slightly bigger then a brass wood insert and after wetting the surfaces to be bonded and coating the screw with Pam or a drop of oil; then mix up enough #405 until it becomes like peanutbutter and bed the insert using the screw wound down to the bottom of the insert and align. It will be stronger and a perfect fit every time! There are many tutorials out there and the only caution I see is if exposed to the sun- top coat with a good UV varnish, as otherwise it will in time become milky in color and break down. Yesterday I hand cut a very tiny teak box and taped it togeather layed in the volt meter and filled it with west. Today finish sand and using the wires I will dip it in the varnish can, mist with thinner if needed and rotate until even and let dry..handsome bullet proff volt meter! I would be lost without west, a definant must have for a waterproof, strong, veristal, repair of any kind.

                 
                5.0

                The Fast Hardner is Great!

                By Big Dog

                from Grand Lake Oklahoma

                About Me Advanced

                Verified Buyer

                Pros

                • Easy to Use
                • Protects Well
                • Very easy to use
                • Weather Proof

                Cons

                • Messy
                • Smelly As In It Stinks

                Best Uses

                • Fiberglass Epoxy Repairs
                • Indoor
                • Outdoor
                • Quick Fix

                Comments about #205 Fast Hardener:

                I have used this alone as a Fast hardner and together with regular hardner to increase epoxy resin setup/cure times. When used alone you must be prepared to act quickly. Get your ducks in row before starting! Because when it starts to setup and cure you will not have a moment to spare before it gets hot and hard. It is fast! When used with the regular hardner I replaced about 20% with the fast and it made my cure to sandable times between patchs a little more reasonable. It stinks but works great!

                (1 of 2 customers found this review helpful)

                 
                5.0

                Great product

                By straight shot

                from wi

                About Me Casual/ Recreational

                Verified Buyer

                Pros

                • Easy to Use
                • Protects Well
                • Visually Pleasing
                • Weather Proof

                Cons

                  Best Uses

                  • Outdoor
                  • Wood Trim

                  Comments about #205 Fast Hardener:

                  I recieved this in just a few days

                  (1 of 3 customers found this review helpful)

                   
                  5.0

                  NOT SO FAST HARDENER

                  By cmc6363

                  from long island,ny

                  About Me Beginner

                  Verified Buyer

                  Pros

                  • Easy to Use
                  • Protects Well

                  Cons

                  • None

                  Best Uses

                  • Indoor
                  • Quick Fix

                  Comments about #205 Fast Hardener:

                  I USED 105 AND 205 ALONG WITH THE MATCHING PUMPS,& FIBERGLASS MESH ;TO FIX A LEAD BEND PIPE ON A 100 YEAR OLD HOUSE.THE DIRECTIONS ONLINE WHERE GREAT AND I EVEN CALLED THE COMPANY FOR ADVICE,THEY WHERE ALSO VERY HELPFUL. THREE WEEKS LATER THE WHOLE IS STILL SEALED. IT'S GREAT TO WORK WITH AND I CAN'T FIND ANY THING WRONG WITH IT.

                  Displaying reviews 1-10

                  Back to top

                  PRODUCT QUESTIONS
                  1 (800) 262-8464