System Three Surf Board Resin SB-112 epoxy is a clear, almost water-white, high-modulus epoxy resin system, specially formulated for use in building surf and sail boards over polystyrene cores. Unlike many epoxy resin systems it cures to a glossy blush free surface. It is unique in that polyester resins and gel coats may be bonded directly to it without using tie coats.
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Viscosity at 77 deg F: 550 cps
Specific Gravity: 9.3 lbs/gal
Viscosity at 77 deg F: 350 cps
Specific Gravity: 8.49 lbs/gal
Mixed System Properties:
Mix ratio by weight resin/hardener: 100/44
Mix ratio by volume resin/hardener: 100/50
Working time at 77 deg F: 37 min
Minimum Use Temperature: 60 deg F
Typical Cured Properties:
Full cure at 77 deg F: 7 Days
Hardness Shore D: 82
Tensile Strength: 7,800 psi
Use protective gloves when working with this product. Use soap and water or white vinegar to get it off of your hands. Use Denatured Alcohol to clean off your tools.
I am looking for an epoxy to mix with graphite powder and colodial silica to help protect the bottow of a kevlar kayak finished in gel coat, and a kevlar canoe, so there will be some flexing in the hulls, with this material crack under a small amount of deflection?
I did not use it for boat repair But in sheets by itself it was fairly brittle
Rob, the people at system three are very helpfull .You should shoot them an email. A surf board shop could help with the flexing question.
Great Product and Great Service!
I use this product on hollow wooden surfboards. I don't use anything else because this is the best. I really like the UV protection since it doesn't require a coat of varnish.
System Three SB-112 Resin
Of course System Three SB-112 is a great product and in my case it is the only epoxy resin that is compatible with polyester resin when polyester is to be used over an epoxy repaired area.The real story here though is Jamestown Dist.I have been a Jamestown customer for decades and I have never been disappointed with any product I purchased from them.