A two-part bonding composition comprising: a part A composition comprising an organoborane-base complex and at least one reactive diluent, wherein the at least one reactive diluent comprises at least one of: i) triallyl isocyanurate; ii) triallyl cyanurate; iii) at least one N-allylamide represented by the formula wherein R 1 and R 2 independently represent alkyl groups having from 1 to 7 carbon atoms, optionally interrupted up to 3 times by oxygen, and optionally substituted up to 2 times with hydroxyl groups, or taken together R 1 and R 2 represent -(CH 2) 3 -, -(CH 2) 4 -, or -(CH 2) 5 -; or iv) at least one allyl ether represented by the formula wherein R 3 represents an n-valent hydrocarbonaceous group having from 1 to 24 carbon atoms, optionally interrupted up to 8 times by oxygen, and optionally substituted up to 6 times with hydroxyl groups, and n represents 1, 2, 3, 4, 5, or 6; and a part B composition comprising at least one free-radically polymerizable monomer and at least one compound capable of decomplexing the organoborane-base complex. a part A composition comprising an organoborane-base complex and at least one reactive diluent, wherein the at least one reactive diluent comprises at least one of: i) triallyl isocyanurate; ii) triallyl cyanurate; iii) at least one N-allylamide represented by the formula wherein R 1 and R 2 independently represent alkyl groups having from 1 to 7 carbon atoms, optionally interrupted up to 3 times by oxygen, and optionally substituted up to 2 times with hydroxyl groups, or taken together R 1 and R 2 represent -(CH 2) 3 -, -(CH 2) 4 -, or -(CH 2) 5 -; or iv) at least one allyl ether represented by the formula wherein R 3 represents an n-valent hydrocarbonaceous group having from 1 to 24 carbon atoms, optionally interrupted up to 8 times by oxygen, and optionally substituted up to 6 times with hydroxyl groups, and n represents 1, 2, 3, 4, 5, or 6; and i) triallyl isocyanurate; ii) triallyl cyanurate; iii) at least one N-allylamide represented by the formula wherein R 1 and R 2 independently represent alkyl groups having from 1 to 7 carbon atoms, optionally interrupted up to 3 times by oxygen, and optionally substituted up to 2 times with hydroxyl groups, or taken together R 1 and R 2 represent -(CH 2) 3 -, -(CH 2) 4 -, or -(CH 2) 5 -; or R 1 and R 2 independently represent alkyl groups having from 1 to 7 carbon atoms, optionally interrupted up to 3 times by oxygen, and optionally substituted up to 2 times with hydroxyl groups, or taken together R 1 and R 2 represent -(CH 2) 3 -, -(CH 2) 4 -, or -(CH 2) 5 -; or iv) at least one allyl ether represented by the formula wherein R 3 represents an n-valent hydrocarbonaceous group having from 1 to 24 carbon atoms, optionally interrupted up to 8 times by oxygen, and optionally substituted up to 6 times with hydroxyl groups, and n represents 1, 2, 3, 4, 5, or 6; and R 3 represents an n-valent hydrocarbonaceous group having from 1 to 24 carbon atoms, optionally interrupted up to 8 times by oxygen, and optionally substituted up to 6 times with hydroxyl groups, and n represents 1, 2, 3, 4, 5, or 6; and a part B composition comprising at least one free-radically polymerizable monomer and at least one compound capable of decomplexing the organoborane-base complex.