Resinous repair pad

Claim 1

Method of making a stable exudation-resistant resin-impregnated adherent fibrous sheet material which when pressed against a receptive substrate and then exposed to actinic radiation will cure to a hard, non-tacky, solvent-resistant state and remain firmly adhered to said substrate, comprising impregnating a porous, fibrous mat with a radiation-curable sticky fluid resinous composition comprising unsaturated polyester, unsaturated liquid monomer copolymerizable therewith, and an acyloin photoinitiator, said resinous composition being present in an amount sufficient to provide the impregnated mat with a sticky surface, enclosing the impregnated mat between a transparent film and another protective supporting web, and then exposing the product to a non-reaction-sustaining amount of actinic radiation sufficient to gelatinize, but not to rigidify, the resinous composition wherein said composition remains in a stable condition substantially free of reaction-sustaining free radicals in which a portion of the composition swells, but does not dissolve when suspended for 18 hours in 1:1 acetone-toluene and in which it exhibits a decrease in penetration value of approximately one-half.