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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

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

$49.99

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

$159.99

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

$1,199.99

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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
 
4.8

(based on 14 reviews)

Ratings Distribution

  • 5 Stars

     

    (11)

  • 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 (13)
  • Protects well (11)
  • Weather proof (10)
  • Visually pleasing (6)

Cons

No Cons

Best Uses

  • Outdoors (8)
  • Quick fix (7)
  • Indoor (5)
  • Wood trim (5)
    • Reviewer Profile:
    • Advanced (5), Casual/ recreational (5)
    • Was this a gift?:
    • No (8)

Reviewed by 14 customers

Displaying reviews 1-10

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5.0

Excellent product for all types of repairs.

By Ss

from Knoxville, tn

About Me Casual/ Recreational

Verified Buyer

Pros

  • Easy to Use

Cons

    Best Uses

    • Indoor
    • Outdoor
    • Quick Fix
    • Wood Trim

    Comments about #205 Fast Hardener:

    Use it for hull repairs

    • Was this a gift?:
    • No
     
    5.0

    I do buy this product time and time again

    By -

    from Sebastian, FL

    About Me Advanced

    Verified Buyer

    Pros

    • Easy to Use
    • Protects Well
    • Weather Proof

    Cons

      Best Uses

        Comments about #205 Fast Hardener:

        I use this product for jobs that either need a quick set time or when it is cold weather her in Florida.

        Service and delivery comments:

        The tiny store here in Vero Beach is always great help with service and tips on DIY projects

        • Was this a gift?:
        • No
         
        5.0

        Very good produce.

        By Dan

        from Auburn, MI

        About Me Professional

        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:

          I make combat weathervanes, which are world war planes, like Mustangs and Corsairs and others. They out in the weather all time. West System holds up great on my planes. Its easy to work with, it sands down great. I highly recommend West System.

          • Was this a gift?:
          • No
           
          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

                        Displaying reviews 1-10

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