The invention relates to an epoxy/rubber composition comprising an epoxy resin which comprises an epoxy compound X, the epoxy compound X has epoxy equivalent weight (EEW) from 150 up to 200 and viscosity from 2,000 up to 10,000 cps (25 C), a curing agent, a liquid rubber that is liquid at room temperature and comprises at least 1.5 reactive terminated group, a fluorine contained organic matter, selected from a group, including where: n=1-20; X=—COOH, —CONH2, —CON(C6H5)2, —CH2OH. b) CF3(CF2)nCOOH, where: n=7-9. where: n=3-20.