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West System 205 Fast Hardener is a low-viscosity epoxy curing agent for use when shorter working and cure time is needed or to provide adequate working time at cooler temperatures.
At 72-degrees, 205 Fast Hardener will have a 9-12 minute Pot Life. When combined with WEST 105 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.
Not intended for clear coating.
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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)
WSY 300, 306-25 or 309
Rate Of Cure:
I am looking to apply closet cedar planks to my bathroom drywall ceiling. It is a moisture prone area because it contains both the shower and tub and I live in a humid area. I am curious if this epoxy product West Systems is recommended for this use as I would like it to last my lifetime? The area is approximately 75 square feet....any idea on how much I might require for an area this size if this is a good choice? Thank you. Aloha, LaRen
LaRen Antoine Cummiskey
Sir: Be certain that you have used "moisture proof sheet rock " as a surface tobond with. Any adhesive is only as good as the surface integrity you are bonding with.Perhaps 3/8 ths inch plywood screwed in place will give you the performance you are looking for. If it is that wet, get exterior glue plywood. Once you have a quality subsurface, West system epoxy will do an excellent job of securing your cedar for all time. Best regards, Dan
Daniel , retired carpenter
A quart kit should do one coat. You could thin it a little with acetone for better penetration.
How much 205 hardener to a gallon of 105 resin?
The ratio is five parts resin to one part hardener.
The ratio is 5 to 1. You would need to do the math, less than a quart bu more than a pint. It would be kind of an odd number since it is 5 to 1.I always do small batches with measuring spoons.
Are there any side affects using 205 when sanded as in rash , itchy ?
Some of us are sensitive/allergic to epoxy. Actually the hardener I believe. I too swelled up badly until I learned. I must avoid the fumes and skin contact. I get rid of the fumes with a fan blowing fresh air into my work area and use rubber gloves combined with long sleeved work shirt with tight cuffs. I am not a boat builder, I am a hobby woodworker. I am currently using West System 105/207 epoxy. I have no problems when I am careful with skin contact and blowing the vapor away from my eyes and that is easy to do.
I use it frequently in the colder weather with no problem. However, if you need to use it cover up and use a dust mask or respirator when you sand.
I had a reaction which caused excessive swelling of my face. My eyes swelled shut for 36 hours. Not from sanding, but from the curing, de gassing of the resin and hardener drying.
can I mix 205 fast hardner with 207 slow hardner?
yes, but it will harden very fast, faster than the fast hardener alone, and it will generate a lot of heat.
J ROBERT KLINGER
I have never done this but i think it would probably work as long as the proper portions are maintained. There's a chance the mixture could shorten the pot life, but i hypothesize that the strength of the bond will not be affected.
Mixing the hardeners results in a cure time in between the two.
I think it would depend where you live and the temperature you're using it. I would think that you could but it would take a lot longer to cure. Don't mix them together, use the pump and do a 50/50 mix. Do 1 pump of 205 then one pump of 207 to two pumps of resin. I don't know for sure because I've never used the slow hardener
For cooler weather
It's west system it almost works without you
Couldn't ask for better service for proven products.
West system epoxy is the best, the service frome Jamestown Dist. exceeded expectations. Thanks
Fantastic epoxy. This will hold up to anything!
A Great product and always dependable
A very dependable product. I've used it in many different applications and has never let me down.
West is best...
If 17th and 18th century English Admiralty shipbuilders could have used epoxy for frigates, man-o-wars, ships of the line, they would have.
West System would have been used by British Admiralty shipwrights in the 17th century if it were available. I'm glad to be able to use it now.
When all else fells I use the west system
The key is the ratio
First time: mix only a small amount-2 or 3 ounces. Use the right ratio! Get a feel for the harding time and your tools.