(Meth)acrylate-functionalized branched polyalpha-olefins which are the reaction product of, at least, a) a (meth)acrylate source and b) a hydroxyl-functionalized branched polymerizate of, at least, i) one or more alpha-olefin monomers having at least six carbon atoms per molecule and ii) one or more unsaturated hydroxyl-functionalized comonomers are useful hydrophobic, reactive components of crosslinkable resin compositions additionally containing a polymer (such as a polyolefin) as well as curable compositions containing one or more additional types of (meth)acrylate-functionalized compounds.