A thermally reversible hot melt adhesive comprising: a) at least one multifunctional diene monomer/prepolymer L- P, wherein i) L is selected from the group consisting of a (poly)urethane, (poly)urea, (poly)ester, (poly)carbonate, (poly)amide, (poly)imide, (poly)styrene, (poly)ether, (poly)(meth)acrylate, (poly)olefin, (poly)siloxane, copolymers of above, including copolymers of maleic anhydride, and mixtures thereof; ii) X is a diene containing one or more of acyclic 1,3-diene, cyclopentadiene, cyclohexadiene, furan, fulvene, pyrrole, naphthalene and anthracene; and iii) P is greater than zero; b) at least one multifunctional dienophile monomer/prepolymer L- Q, wherein i) L is selected from the group consisting of a (poly)urethane, (poly)urea, (poly)ester, (poly)carbonate, (poly)amide, (poly)imide, (poly)styrene, (poly)ether, (poly)(meth)acrylate, (poly)olefin, (poly)siloxane, copolymers of above, including copolymers of maleic anhydride, or mixtures thereof; and ii) Y is a dienophile containing one or more of a maleimide, isomaleimide, citraconimide, itaconimide, maleate, fumarate, acrylate, methacrylate, cyanoacrylate, benzoquinone, benzoquinone oxime, benzoquinone imine, naphthaquinone, alkylidene malonate, alkyne containing electron withdrawing groups and mixtures thereof; and iii) Q is greater than zero; and wherein at least one of P or Q has a value greater than 2.1. a) at least one multifunctional diene monomer/prepolymer L- P, wherein i) L is selected from the group consisting of a (poly)urethane, (poly)urea, (poly)ester, (poly)carbonate, (poly)amide, (poly)imide, (poly)styrene, (poly)ether, (poly)(meth)acrylate, (poly)olefin, (poly)siloxane, copolymers of above, including copolymers of maleic anhydride, and mixtures thereof; ii) X is a diene containing one or more of acyclic 1,3-diene, cyclopentadiene, cyclohexadiene, furan, fulvene, pyrrole, naphthalene and anthracene; and iii) P is greater than zero; i) L is selected from the group consisting of a (poly)urethane, (poly)urea, (poly)ester, (poly)carbonate, (poly)amide, (poly)imide, (poly)styrene, (poly)ether, (poly)(meth)acrylate, (poly)olefin, (poly)siloxane, copolymers of above, including copolymers of maleic anhydride, and mixtures thereof; ii) X is a diene containing one or more of acyclic 1,3-diene, cyclopentadiene, cyclohexadiene, furan, fulvene, pyrrole, naphthalene and anthracene; and iii) P is greater than zero; b) at least one multifunctional dienophile monomer/prepolymer L- Q, wherein i) L is selected from the group consisting of a (poly)urethane, (poly)urea, (poly)ester, (poly)carbonate, (poly)amide, (poly)imide, (poly)styrene, (poly)ether, (poly)(meth)acrylate, (poly)olefin, (poly)siloxane, copolymers of above, including copolymers of maleic anhydride, or mixtures thereof; and ii) Y is a dienophile containing one or more of a maleimide, isomaleimide, citraconimide, itaconimide, maleate, fumarate, acrylate, methacrylate, cyanoacrylate, benzoquinone, benzoquinone oxime, benzoquinone imine, naphthaquinone, alkylidene malonate, alkyne containing electron withdrawing groups and mixtures thereof; and iii) Q is greater than zero; and wherein at least one of P or Q has a value greater than 2.1. i) L is selected from the group consisting of a (poly)urethane, (poly)urea, (poly)ester, (poly)carbonate, (poly)amide, (poly)imide, (poly)styrene, (poly)ether, (poly)(meth)acrylate, (poly)olefin, (poly)siloxane, copolymers of above, including copolymers of maleic anhydride, or mixtures thereof; and ii) Y is a dienophile containing one or more of a maleimide, isomaleimide, citraconimide, itaconimide, maleate, fumarate, acrylate, methacrylate, cyanoacrylate, benzoquinone, benzoquinone oxime, benzoquinone imine, naphthaquinone, alkylidene malonate, alkyne containing electron withdrawing groups and mixtures thereof; and iii) Q is greater than zero; and wherein at least one of P or Q has a value greater than 2.1.