COVID-19 Update: We are open & shipping orders! We are working hard to ship as quickly as possible, while ensuring the safety of our associates. Send us your questions and our Total Support Team will respond by email or phone as soon as we can!
Jamestown Distributors(800) 497-0010
Click to watch the JD Search Tutorial video & learn
all about searching and browsing on Jamestowndistributors.com
MAS Slow hardener is formulated for use with MAS epoxy resins and can be applied in a wide range of conditions where increased working time is required.
We highly recommend MAS Slow Hardener when coating or laminating large surfaces. The Slow formulation cures blush free and eliminates the need for time consuming wash downs during on-going laminations or repetitive build coats.
Use this hardener (200-250 poise) with MAS low viscosity epoxy resin for fast wet-out of reinforcing fabrics.
Note: Due to this item's high hazardous content, the 4 gallon and larger containers cannot be shipped by UPS or FedEx under any circumstances.
Available in Pint, Quart, Half Gallon, Gallon, 4 Gallon, and 5 Gallon sizes.
Use protective gloves when working with epoxy resin systems. Use soap and water or white vinegar to clean your hands. Use Denatured Alcohol to clean your tools.
Rate Of Cure:
cure time of epoxy to varnish?
Sorry, didn't use varnish, just Interlux Brightsides one part polyurethane. We took two days of prep time before painting --- sanding and filling and sanding.
Didn't take note of this but it wasn't all that long. The epoxy cured well, evenly, no problems
how long is the working time with the slow hardener?
It's been a couple of years but I would say that at least 30-45 minutes obviously depending on ambient temperature. For example I would work one half of a 15' strip built daysailer at a time with the appropriate volume of mix at 60-70F. Best to coat when mix is fresh and flowing well rather than "push" the limits of working time.....I have been very pleased with the results on 3 different projects ....
You typically have 30 minutes all temperature dependent. I live in Texas and even in the dead of summer I can work at least 20 minutes before it kicks. This is a product I have worked with for years and it is very dependable
It depends greatly on the temperature and the size of the batch. At 50 deg's it could be up to an hour or more. At 90 deg's it could start kicking in 1/2 hour. The bigger the batch, the more heat it will generate, speeding the cure.
How is MAS for woodworking? Wooden chair repair? I have only used System 3.
I have used MAS epoxies several times including building an interior within a 33' captains gig, cabinets, half bulkheads, tabbing support members, etc. and as well built a cedar strip daysailer .....all with the slow hardener. I found it a great system and the slow hardener gives extended layup and clamping time without amine blush that requires wash downs...
I usually just pour into 1oz (30ml) calibrated cups, for amounts anywhere from 6 ml up. For smaller amounts I just use a thin stick and count drops.
Thanks. I may switch to MAS.
It'll bind any wood rather permanently. I like MAS best, of all the epoxies, because it won't blush, even when used in cold rooms. I don't know if WEST blushes or not, but I'm certain MAS doesn't, so that's the brand I've stayed with.
I would say it would work well as long as you are going to be abled to tuen the chair so the epoxy does not run befoe it thickens. I used it on wooden boat construction and small parts construction and it worked well. I always worked in te,peratures at 70 or above. If it is colder than that i feel the time to thicken might get excessive.
I use the low viscosity MAS epoxy which penetrates the wood very well. It dries clear and is quite strong. I have filled screw holes that have been stripped and then drilled the epoxy for a new screw. This has worked very well for me.
I have found MAS Epoxy to be excellent for all kinds of woodwork. It hardens clear with no residue and is relatively tolerant of measuring inaccuracies. For use as an adhesive on wood I would also use some silica thickener. Apply a thin amount of un-thickend epoxy first to the surfaces to be glued, then thicken the mix to a peanut butter consistency and apply some of this as a gap filler, then clamp the parts together. Cure time will depend on the type of hardener you used (fast or slow) and the temperature.
Thanks both of you
Thanks. Yeah I do use thickener. Comment appreciated. Esp mixing tolerances. How do you mix it. Currently I use the pumps.
I'm looking for an alternative to devcon 2 ton epoxy. I use the epoxy to coat wooden fishing plugs that I make. The Devcon is giving me fits with bubbles. What would you recommend?Richard
Thank you Nick
Richard I've never used devcon 2 ton epoxy, but I've built a cedar strip canoe and two cedar strip kayaks and with the two kayaks I used Mas epoxy with slow hardener. I found it much to my liking and will definitely use it again on any future projects. I've tried other epoxies and like the Mas the best. Good luck with your fishing plugs!
MAS works well but your problem is out gassing. That happens if you have a hot day as the wood heats it gasses. After the first 2 coats it should stop. Is be willing to discuss it at area code 520 cell 7848460
It could be that the viscosity is too high and you might be better off with something thinner MAS or WEST are both pretty thin. If you have access to a vacuum pump you could try degassing the Devcon after mixing and before applying
Thank you Gary for you insight
Can I add white color of some type to the slow set epoxy?
It will depend on the chemical content of the additive you are using. I would suggest mixing a "1 pump" batch of epoxy, put in your additive and use to glue two pieces of scrap wood. If they bond and hold then you have your answer.
what size hardner is needed with a gallon MAS?
MAS is a 2:1 mix ratio so you will need 1/2 a gallon of hardener to a gallon of resin, thanks.
What is the minimum temperature I can use the Mas Epoxy with slow hardener?
Bill,I've used MAS epoxy for over 15 years and would never change. I'm not sure what the label says, but I set the thermostat in my barn at 60 and it's hard the following morning. I turn the furnace off at that point and have had no problem with final cure.
I used the slow hardener during the fall in Ohio and didn't have any problems as long as the temp was at least 60 degrees F.
don't know what the min is; i've used it without problems when the temp in the work room was in the 40s, but never below; i recommend keeping the resin and hardener in a room temperature room for long term storage; you may also want to mix the hardener and resin in the warm room first, and then take the batch you've mixed to the cold room for application
I have not used MAS epoxy under about 50 degrees. It cures more slowly as ot gets cooler, also, the resin gets thicker as it get colder. The thick resin can be hard to measure with thepumps and accurate measurement is very important, I worked in a shop that would be very cool when I arrived and would warm the resin in the gallon container with a heat gun.A tub of hot water would also work. We then kept the kayaks we were working on warmer with lamps placed under the boat. If you are using epoxy to seal a surface as we used it as a water barrier and base for varnishing on the kayaks it is best to either keep the boat at a constant temperature orget it warm and let it slowly cool as the epoxy hardens. This prevents outgassing which forms small bubbles in the epoxy surface. Outgassing happens whhen the wood warms and gasses in the wood expand and get relased from the wood but get trapped in the hardening epoxy.I hope this helps Gary
RICHARD A WIESEN
I just checked the MAS website . they say that 45degrees is adequate for bonding. 55 to 60 degrees for clear coating Gary
RICHARD A WIESEN
You don't want it to freeze but otherwise you should be safe. The cooler the temp, the longer the curing process.Tom
would this product be good for a deck that is immediately sitting above a Garage as extra strength?
MAS epoxy is a great waterproof protection but does not provide any ultraviolet protection so you would still need to add a uv coating or the epoxy will break down. I don't think you will get any added strength, only added waterproofing.
I used the product in several coats over fiberglass to finish a kayak. Can't say whether it would be best for your application.
Silverio, While MAS Slow Epoxy Hardener is an excellent waterproofing agent, and certainly would be durable as a deck surface, it may be a bit slippery when it gets wet. You may wish to sprinkle dry sand onto the epoxy immediately after brushing or rolling it on to control the slippery condition.
I am very happy with the MAS line of Epoxies
I am not an epoxy expert by any means, and Ifound MAS epoxy to be very easy to work with. Additionally, I have found Jamestown Distributors to be even easier to work with, and are now my first choice.
Good in the heat
Using to lay out a large section of Dynel in 80 +degree heat and it keeps the epoxy workable just long enough to squeegee out after rolling.
MAS epoxy hardener
Great stuff and easy to use.
Kretchman fly rods
Kittery Point, Maine
Not as toxic as other hardeners. 2:1 mix with Mas resin as opposed to 5:1 West Systems. No yellow tint as with West System
nice and slow
it works nice and slow giving you a lot of working time. In colder temps it might be better to use a faster hardener but I have not tried it.
Great product, easy to work with.
I first used this product while building Skerry from Chesapeake Light Craft. It's supplied with the kit. It's long working time make it very easy to use for the novice boat builder. The beautiful amber hue it imparts to wood and it's diamond hard finish will give you a boat that will be passed down for generations. Make sure to cover with a Good UV varnish so the epoxy doesn't yellow with age.
This product has made my work easier
I work with reclaimed wood this combined with the low viscosity resin does a great job of filling cracks and securing knots, saves me a lot of time.
Jim wood worker
Excellent working time
The Mas slow hardner system is an excellent choice for people who need a little extra set up time as it is slower to go off than some other epoxies I have used. It sets up clear on it's own and mixes well with additives. I will be using this product on all my new projects.
a perfect blend
I used the MAS Epoxy resin products for repairs on an Hydra Sports Aero Cobra I am restoring. The slow hardener was a great choice for the repairs I had and did everything MAS said it would. Its slower set up time gave me plenty of time to work. It was easy to mix and apply. I ran out with one small job to do so I bought another brand locally. I greatly preferred the MAS over the other brand.