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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 11 reviews)

Ratings Distribution

  • 5 Stars

     

    (8)

  • 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 (10)
  • Protects well (9)
  • Weather proof (8)
  • Visually pleasing (5)

Cons

No Cons

Best Uses

  • Outdoors (6)
  • Quick fix (5)
  • Indoor (4)
  • Wood trim (3)
    • Reviewer Profile:
    • Advanced (4), Casual/ recreational (4)
    • Was this a gift?:
    • No (5)

Reviewed by 11 customers

Displaying reviews 1-10

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5.0

An excellent product for general fiberglass work

By Capitan Tango

from Houston, TX

About Me Advanced

Verified Buyer

Pros

  • Easy to Use
  • Protects Well
  • Weather Proof

Cons

    Best Uses

    • Outdoor
    • Quick Fix

    Comments about #205 Fast Hardener:

    Used it below the waterline to cover two no-longer-used through-hull holes (with appropriate fiberglass). I had no trace of any problem after 2 years constantly in the water. Invisible from the outside or inside after sanding and painting.

    • Was this a gift?:
    • No
     
    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

                    Displaying reviews 1-10

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