MAS Epoxy low viscosity resin contains a superior blend of low molecular weight epoxy resin and reactive dilutents, resulting in an easy-flowing reliable system with low drip and no blush.
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 of colloidal silica for filling and fairing compound applications.
MAS epoxy is typically used at room temperatures using your choice of hardeners (MAS recommends using their own Fast, Medium or Slow) in a 2 parts resin to 1 part hardener mix 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.
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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 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.
MAS technical support people can give you a definitive answer. I have used it in temperatures as low as 55 F with no problem, although it takes a long time to fully cure at this temperature-12 to 15 hours with the medium hardener.Larry CheekWhidbey Island, Washington
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.
Sorry, I do not know for sure.
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!
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've used MAS epoxy with several different types of glass all with excellent results. If working large pieces use the slow hardener.
The two are perfectly compatible
Is MAS epoxy food safe? Can you use it to laminate cutting boards or for a surface where food is prepared or eaten? Thank you.
No, Low Viscosity Epoxy Resin is not considered "food safe". MAS sells another epoxy product for lining potable water tanks that is "food safe".
I recommend following the other answer regarding the food safe stuff.
I cannot answer this question, we do not use this product for that purpose.
I have only used the epoxy for boatbuilding so I can't directly answer your question. I would write the MAS technical help folks. They have always been very responsive to the questions I have asked.
Can I use this to coat my gunwale and outside shear rail of my driftboat before varnish. No fiberglass just a coat of epoxy?
Yes. I built an eleven foot dinghy and only the lower portions of the hull were fiberglassed and the rest of the dinghy was covered with three coats of the epoxy resin. The epoxy must be coated with a UV blocking varnish for protection. All epoxies will eventually break down with prolonged UV exposure.
MarkI cannot answer your question. I suggest you call the manufacture.
I just received mas low viscosity resin and slow hardner. What is the re coat time?
My understanding is that can be re coated at any time, because it does not get. An oil sheen on it. That,s the advantage of using MAS I have re coated at different time intervals and have experienced no problem.
24 hours for sure. I wait 2 days til it hardens so you can sand between coats.
Depends a bit on temperature, but I normally allow 12 hours.
In my experience, 24 hours works best. But you might want to check around with other users. It's a great product.
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.
Wooden Airplane Restorer
delivered on time and as expected
These MAS products have consistant quality, enabling predictability of the outcome.