Sunjunkie Booster Drops , by adding 0.5ml per 57ml's of your solution it will increase the strength of the solution by 1% with ease! Our tanning solution has been fine tuned to run in harmony with most spray Tanning Systems. Parameters like viscosity, density and adherence have been optimized, resulting in minimised overspray and the most even coverage possible. Please request FREE customer care leaflets, if required.