Embodiments of the present disclosure provide a composition that includes a phosphorous-containing compound, a cyanate ester, an epoxy resin, and a maleimide. For the various embodiments, a viscosity of the composition increases less than 100% as measured by Gardner Bubble Viscosity a temperature of 23 DEG C in at least 3 days. For the various embodiments, the composition of the present disclosure can also include an aprotic solvent, such as a ketone. Embodiments of the present disclosure further include a composition that includes the phosphorous-containing compound, the cyanate ester, and the aprotic solvent. For the various embodiments, the composition can also include the epoxy resin and the maleimide. For the various embodiments, the composition does not include an aliphatic alcohol.