SB-112 is a clear, almost water white high-modulus epoxy system, UV-resistant for maintaining longer surface gloss. Unlike many epoxy systems, SB-112 will cure to a clear, glossy, blush-free surface. Use as a sealer, topcoat, saturation coat or tie-coat.
SB-112 is a two part epoxy system that excels as a primer/tie coat for polyester resin materials. SB-112’s surface does not inhibit the curing of the polyester resin at the interface. What results is an exceptional bond between the epoxy and polyester resin systems.
• Features a convenient 2:1 mixing ratio
• Solvent Free
• Ideal for polyester gelcoat repair
• Blush Free
• Grain Sealer for wooden musical instruments
Working Time @ 70°F (21°C):
Mix Ratio by Volume: 2:1
Mix Ratio By Weight: 100:44
Originally developed to serve the surf and sailboard industries, SB-112 has UV-resistance that provides additional durability from sun exposure for manufacturers demanding the highest performance in punishing environments.
Our products tend to find users and markets well beyond our initial expectations. SB-112 is no stranger to this phenomenon.
Today, the luthier community uses SB-112 as the premier coating and pinhole filling epoxy and it can be found in guitars around the world.
What is the SilverTip Series?
General Purpose Epoxy was our first product when System Three launched in 1979 and remains one of our bestselling, most loved products. At the time, it redefined the category by offering consumers an epoxy system that could be used in a wide variety of environments.
We revisited that playbook with the introduction of our SilverTip Series. In an effort to make epoxies even more accessible, we have "eliminated the guesswork" by formulating application-specific epoxy products to address every common marine project. With the most user-friendly epoxy products on the market, the SilverTip Series, we're making boatbuilding easier and more fun.
The general rule is that epoxies will bond over cured polyester but polyesters do not bond over epoxies. To get around this problem, we developed a resin system that can be used as a "tie-coat" barrier and is unique in allowing polyester resins and gel coats to be bonded directly over it. This epoxy is called the SB-112 and is available on our website.
System Three offers one epoxy system called SB-112 that is UV-resistant. This epoxy system is formulated to have maximum ultra-violet light resistance. However, epoxies in general do not perform well in exterior environments where UV exposure occurs. Exposure to direct sunlight causes the epoxy to break down, which leads to the possibility of moisture intrusion to the substrate. Epoxies which have UV absorbers added, such as SB-112 gain some UV resistance and are good for projects that will only have short exposure to the sun. Projects that will be in long term direct sunlight will benefit from applying paint or a quality UV protective clear coat.
We get a number of requests from luthiers (stringed instrument makers) on how to fill pores in the wood bodies. We are not experts in this field, but we have many customers who use our SB-112 Epoxy for this application.