In view of the photoactive properties and potential penetration of fine TiO2 particles to human skin, it is important to seek a compromise to provide the optimum attenuation effects of UV by minimizing the quantity of TiO2 used in developing a sunscreen. In this paper, titanium dioxide powder was used as fine particles to coat coarse nylon and polyethylene particles by high-speed rotational impact blending. The effects of the coating ratio and size of the coarse particles on the effectiveness of UV attenuation were investigated. The effectiveness of UV protection was found to be increased by decreasing the coating ratio, as this led to a lower level of surface agglomerates being formed. A further advantage of coating large polymer particles with fine titanium dioxide was an improvement in the bulk dispersion, which resulted in optimum UV protection.