[header] How to stamp concrete with elite crete system's concrete solutions [title] Pressure wash the surface with a 3200 psi pressure washer. [step] The goal here is to remove any foreign particles in the pores of the substrate and also to remove any loose concrete. [title] Mix 1 part muriatic acid with 8 parts of clean water and put this in a watering jug or pump up sprayer. 
[step] It is important to use a plastic sprayer as the muriatic acid will corrode metal sprayers. [title] Spray the acid and water mixture on the surface.