Abstract: A waterborne photoimageable composition, developable in alkaline aqueous solution, which is hardenable to form a hard, permanent layer suitable as a solder mask, comprisesA) between about 25 and about 40 wt % of a latex acrylic binder polymer having an acid number between about 125 and about 200 and a number average molecular weight of between about 20,000 and about 80,000,B) between about 13 and about 30 wt % of a waterborne epoxy resin having an epoxy equivalent weight of between about 100 and about 700,C) between about 20 and about 35 wt % of photopolymerizable, multi-functional .alpha.,.beta.-ethylenically unsaturated monomer and/or short-chain oligomer having a molecular weight between about 500 and about 2000,D) between about 4 and about 20 wt % of a free-radical generating chemical system,E) between about 0.5 and about 10 wt % of an epoxy curative and/or cure catalyst, andF) between about 3 and about 12 wt % surfactant(s), the weight percentages being based on total weight of A)-F).