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West System205-B Fast Hardener

Q: how much hardner do i need for 4.35 gallons?

The resin and hardener come as a 5 to 1 ratio. The resisnt exactly a gallon, the hardener in I think a 25 oz can goes with a “gallon” of resin so you would need to get five of these 25 oz cans of hardener and you’ll have 2/3 of a can of hardener left when you’ve used up your 4.35 gallons of resin.

Q: I have used Envirotex Lite to coat tiles and it is crystal clear but SO long to cure. Question is if this is crystal clear? And how long to cure?

You have to use 207 hardner and 207 resin. Go to West system site and read about clear finish.

Q: Do these containers come full ? appeared to have channellock marks on lid channel and there was hardener on inner lid. Missing 2 inches of product.

It doesn't matter. It was obviously opened by someone. Just return it and get another one or a refund.

Q: My set of resin and hardener came today, but the hardener is brownish/redish in color when I pump it out. Is that correct or should I return it?

My hardener was slightly brownish when mixing with the resin, but after mixing it would clear up, and it would harden clear as well. If it is very pronounced, you may have a problem, but if it is just a tint that goes away when you mix, that seems to be normal. You may want to do a test on some scrap material to confirm.

Product ID: 5397946

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Details

Brand
West System
Specific Uses For Product
Tile Repair
Material
Epoxy
Item Form
Liquid
Special Feature
Waterproof

⚡Rapid cure in 6-8 hrs

🌡️Cures down to 40°F (4°C)

🛠️5:1 resin-to-hardener ratio

Frequently Bought Together

West System 205-B Fast Hardener, Epoxy, Liquid, Epoxy Hardener, Clear

Polycell Multi-Purpose Polyfilla Ready Mixed, 1 Kg

Description

⚡ Cure fast, bond stronger — don’t let time slow your craft!

COLD WEATHER READY - Reliable curing performance even at chilly 40°F, so your work never has to pause for the season.
SPEED MEETS STRENGTH - Fast curing epoxy that reaches solid state in under 8 hours, perfect for tight project timelines.
PRECISION MIXING RATIO - Optimized 5:1 resin-to-hardener blend ensures consistent, high-strength bonds every time.
VERSATILE CUSTOMIZATION - Easily tailored with fillers, additives, and pigments to match any bonding, coating, or fairing need.
MOISTURE RESISTANT DURABILITY - Creates a rigid, moisture-resistant solid that stands up to demanding environments and professional standards.

West System 205-B Fast Hardener is a medium-viscosity epoxy curing agent designed for rapid, high-strength bonding and coating. It mixes with West System 105 Resin at a 5:1 ratio, cures reliably at temperatures as low as 40°F, and achieves solid strength within 6-8 hours. Ideal for professionals needing quick turnaround and durable, moisture-resistant results.

Have a Question? See What Others Asked

how much hardner do i need for 4.35 gallons?

I have used Envirotex Lite to coat tiles and it is crystal clear but SO long to cure. Question is if this is crystal clear? And how long to cure?

Do these containers come full ? appeared to have channellock marks on lid channel and there was hardener on inner lid. Missing 2 inches of product.

My set of resin and hardener came today, but the hardener is brownish/redish in color when I pump it out. Is that correct or should I return it?

Reviews

D**T

Worth the expense!

Outstanding Application every time!

1.03.2025

J**.

Delivery ahead of schedule

Timely delivery of product is always desirable. West systems offers among the best performance for an adhesive and structural epoxy. Not to be confused with a slow cure or high depth of pour product.

6.06.2024

S**S

Great product for boat repairs

The West System of epoxy products are fantastic for boat repairs. Have used West products for over a decade and am very pleased with the results.

20.04.2023

K**N

Know quality,know WestSystem. No quality,no WestSystem.

Can't go wrong with West System.This is the fast hardener, compared to the Slow. Duh.The other pic is of their 404 high-density filler. I use it to make the epoxy thicker. I have dyed it also to make it match the color of wood. Works great!Thanks West System, your a good guy.

1.04.2021

M**G

Top notch product

Use with 105 for a great finish

16.04.2023

C**A

Ok item

Good item

24.03.2024

A**R

Great epoxy for boat repairs!

This stuff is expensive, but it is the best I have ever used. Never lets you down.

6.06.2022

A**K

Stick with West Systems

Stick with West SystemsJust as advertised. This seller also packages the containers correctly (i.e. UPS pronounced OOPS couldn't damage them during shipping. Wish I could say the same for the outfit that sold me the resin.GET THE PUMPS. They make using this stuff a breeze. I don't know where the negative reviews are coming from, I got 2 sets of pumps for the various hardeners etc and haven't had any problems.

2.12.2013

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