Hardener formulation for cold curing epoxy systems

A curable composition comprising:

• (a) at least one liquid epoxy resin selected from the group consisting of bisphenol A diglycidyl ether, bisphenol F diglycidyl ether, a novolac epoxy resin, and mixtures thereof;
• and
• (b) a hardener composition comprising:
• (1) from about 5 weight percent to about 50 weight percent, based on the total weight of the hardener composition, of a first epoxy-amine adduct,
• (2) from about 2 weight percent to about 30 weight percent, based on the total weight of the hardener composition, of a second epoxy-amine adduct, and
• (3) from about 1 weight percent to about 15 weight percent, based on the total weight of the hardener composition, of an accelerator component comprising methanesulfonic acid;
• wherein the first epoxy-amine adduct is provided as an epoxy-amine adduct composition comprising about 30% to about 90% by weight of an adduct of bisphenol A diglycidyl ether and isophorone diamine and about a weight balance of unreacted isophorone diamine;
• wherein the second epoxy-amine adduct is provided as an epoxy-amine adduct composition comprising about 30% to about 90% by weight of an adduct of bisphenol A diglycidyl ether and m-xylylenediamine and about a weight balance of unreacted m-xylylenediamine;
• and
• wherein a ratio of the epoxy-equivalent in (a) to the amine-hydrogen equivalent in (b) is from about 1:0.5 to about 1:1.5.