Please choose the correct ending to complete the given sentence: Home and Garden: [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.

Ending1: [title] After loosening the concrete from the surface use a leaf blower to clean off any remaining water in the pores of the concrete. [title] Allow the concrete to dry after the copper compound has dried. Ending2: [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. Ending3: [title] Add 600 grit sand to a waterproof bucket or wheelbarrow and pump up water to the depth needed for filling. [title] Pour the agreed on amount of cement mix into the thrown away concrete job. Ending4: [step] Fill it to the max with the recommended sealant. Put rubber band on the side of the sprayer to prevent any overflow.

Answer format: ending1/ending2/ending3/ending4