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Jamestown Distributors(800) 497-0010
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MAS Epoxy Low Viscosity Resin has a superior blend of low molecular weight epoxy resin and reactive dilutents, for an easy-flowing, non-blushing system.
Use for barrier coatings, laminating, and bonding. Low viscosity epoxy provides complete wet out of fiber-reinforced fabrics, reducing the potential for voids and other imperfections. Modify with fillers such as wood powder or colloidal silica for filling and fairing compound applications.
MAS epoxy is typically used at room temperatures using your choice of hardener (MAS recommends their Fast, Medium or Slow hardeners) in a 2 parts resin to 1 part hardener ratio. This versatile resin system can be used in a wide variety of applications, including boat hulls and structures, as well as laminating and bonding of nearly all materials.
Available in Quart, Half Gallon, Gallon, 4 Gallon, and larger sizes.
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Amine blush is a waxy layer that forms during the cure process of most epoxy resins. No blush is critical if you intend to apply additional epoxy or varnish over it. MAS epoxy won't blush as long as it is applied in anything under 98% humidity.
Specific Gravity at 77 degrees F: 1.08 - 1.13
Density (lb/gal) at 77 degrees F: 9.6
Flash Point (closed cap): 200 degrees F
Percent Reactive Solids: 100
Mixed Viscosity with MAS Hardener: 550-650 cps
Mix Ratio: 2:1 Resin to Hardener
Use protective gloves when working with this product. Use soap and water or white vinegar to clean your hands. Use Denatured Alcohol to clean your tools.
What is the pot life after mixing
You can find a table for potlife in the link for tech data on this page: https://doc.jamestowndistributors.com/userportal/pdfs/MAS_Epoxies/mas_2to1_epoxy_system_tds.pdf
Your tech data lacks critical info..What is the mixed viscosity?What is the heat distortion temp?
the mixed viscosity is pretty much the same as west systemÂ definitely thin enough to wet out fiberglass nicely. the heat distortion temp I don't know.
Mas, doesn't state that information, here is their phone # TELEPHONE: +1 651 451 8000
JD Tech Team
Is MAS low viscosity epoxy compatible with West Systems?
I don't know.
They will bond to one another, but you wouldn't want to mix them in layup.MAS is far easier to work with and produces crystal clear results. Cleanup with rubbing alcohol not acetone...MAS is no blush which means no sanding between coats...Highly recommend MAS. Haven't used West in years....
After surface prep you can bond Mas to cured West. I wouldn't try to mix the two resins or hardeners.
I'm sorry, I never mixed the two.
Yes, you can use it either over or under West Systems epoxy.
JD Tech Team
What is the shelf life of the Mass epoxy resin?
I have used the MAS epoxy that over a year old. However make up a small amount to test it before using on a project. Jim
There should be no real shelf life. The hardener will amber over time, and crystallization may occur, but by heating the container to 140-150 deg F it will return to the original state. See their tech guides on reversing crystallization.
JD Tech Associate
What is the coldest temperature at which MAS epoxy can be applied? I have a lot of boat work to do this Spring and need to know when I can start.
Hi- I use it throughout the winter but keep the heat at 50 or above when working. It has never failed me at this temp or above. I have never tried it below 50 though and am not sure how that would work. A simple way to find out if you already have it, is just mix up a tiny batch in a small cup and let it sit over night. If it is hard in the morning, you are probably fine. I have forgotten what it says about that on the bottle but have a vague recollection that don't recommend doing it below 50 but you can check your bottle yourself. I suspect trying to get it to work below 40 degree is probably pressing it.... Good Luck ....
They post data going down to 41 deg F on their site, but the cure time takes a long long time, and you may bring new factors into getting a good mix/cure.
JD Tech Associate
I need to apply another fill coat to my project, which was done with MAS low viscosity and slow hardener, using Total Boat same ratio 2:1 with medium hardener. Any compatibility or performance issues? I just ran out of mas hardener.
Those two specific hardeners do not have compatibility issues--not all 2:1 epoxies have compatible components but in this case it will work.
JD Tech Associate
can you gel coat over mas epoxy
You can apply gel coat over epoxy but will need to be sure it is very clean, wash and scrub with water, sand and clean a couple times with acetone. Gelcoat is best (less work) on polyester resin.
JD Tech Team
I am replacing the teak and holly plywood cabin sole in my Cal 33. I need to coat the underside of the plywood sections and all the edges to protect from moisture before setting the pieces in place. Would this product be a good choice for this use?
Yes, you could but it will sit on the surface of the plywood. Better to use Totalboat Clear Penetrating Epoxy first it will penetrate the fibers of the wood and seal it.
I am considering using this product as the top coat on my home bar that I built. I am looking for something durable, water and chemical resistant, and that can be brushed on. Will this product be able to do what I am looking for? Also, if you think it will work, what hardener would you recommend. My thoughts were to use the slow hardener, that way I have plenty of time to make the application.
Yes, this will work but will take a number of coats if you want to build it up to a thick coating. The slow hardener will give you 23 minutes of working time at 77 degrees.
can I use West System episize glass fiber, with MAS low viscosity epoxy resin? I need 6 oz. 60" wide cloth.
The two are perfectly compatible
I've used MAS epoxy with several different types of glass all with excellent results. If working large pieces use the slow hardener.
You can use any west system filler or glass product.They are made for "epoxy", not a special manufacture.I've used mas for years and have neverhad any problem.They have a great tech support.I had a question a few years ago and ended up speaking to the head chemist!
I reviewed the spec sheet on this West system product. it seems to be simply fiberglass. There should be no problem with combining the two. Good luck!
Sorry, I do not know for sure.
First time using this company and find it to be great stuff. Mixes well and with no blush, which is nice when using on Dynel.
Works well.....will continue to purchase the resin & hardner
.....btw, i find it interesting that I ordered these two products on a Sunday & on Monday, I received a notice from Jamestown that any order over $100.00 would be shipped free.......I paid for the shipping on this order.........
Edisto Island, SC
I fear I will have to buy this product again and again
Doing minor repairs. Sets up very quickly (10-15 minutes?). Does job just fine.
Works very well, the pot life and working times are as stated.
Fair Have Michigan
great, easy to work with epoxy
I use this for sailboat repairs, always consistent results.MIX IT WELL
MAS Low Viscostiy Epoxi Resin
Even if you can't heat your workshop to plus 60 degree F, you will get good fiberglass penetration and easy use. If to cold use heat gun and you still have plenty of time before curing.
Englewood, New Jersey
my favorite resin
repairing a small pram
Works as advertised, yet another great epoxy.
Effective in taping and filleting a pair of "stitch and glue" outriggers.
Excellent for repairing delaminations
I had multiple small areas of surface (non-structural) delamination to repair. I drilled #30 holes at opposite ends of the each area, then applied heat and pressure to set the glass back down. Then I used a 6cc plastic veterinary syringe, a tight fit into one #30 hole, to force the low-viscosity epoxy into the area until it flowed out the other hole. Finally, I covered the area with a non-stick plastic sheet and used 25# lead shot bags to hold it down until the epoxy set. Using the fast hardener, this was just a few hours.