Isothermal reaction rate DSC data from a visible-light-cured (VLC) resin composite were deconvolved using basic time and frequency domain methods, optimised frequency domain methods and iterative methods. The performance of the different methods varied considerably The constrained iterative method, in conjunction with low pass noise filtering, proved to be the most suitable, requiring minimum user intervention to yield corrected heat flow data that can be used for subsequent kinetic analysis. The validity of this deconvolution method was verified by re-convolving the deconvolved data, which gave a good approximation to the original experimental heat flow curves.