Colour variations due to changes in paint film thickness and pigment content were studied experimentally. An analytical model was used to predict solvent concentration gradients in the paint films and calculate Marangoni numbers, which determined the velocity of fluid motion. Curak, Marina et al., Progress in Organic Coatings, 2019, Vol. 136, p. 105173. 544,100 tonnes of water-borne coatings were consumed in the automotive and transportation sectors in 2018. A current work analyses the electrical heating by Joule's effect of epoxy resins doped with carbon nanotubes ...