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What it does S.P.R. Full Protocol bundles the four steps of the S.P.R. (Sensorial Porosity Reconstruction) service into a single kit: S.P.R. Shampoo (Step 0), Protein Infusion (Step 1), Seal & Protect (Step 2) and Acidic Closure (Step 3). Together they clean, infuse botanical peptides into the cortex, lock the peptides in place and close the cuticle at pH 3.5, in one appointment of roughly 30 minutes' chair time. How to use it Step 0: apply S.P.R. Shampoo to wet hair and scalp, massage 2 to 3 minutes, rinse. Step 1: apply Protein Infusion to mid-lengths and ends, leave 10 minutes (heat optional), do not rinse. Step 2: apply Seal & Protect over Step 1, leave 10 minutes (heat optional), rinse thoroughly. Step 3: apply Acidic Closure to mid-lengths and ends, leave 5 minutes, rinse thoroughly and finish as desired. What not to do Professional use only, for all four products. Do not skip a step or run them out of order: Step 1 is designed to be sealed by Step 2, not rinsed out on its own. Do not rinse between Steps 1 and 2: they share a single joint rinse, after Step 2. For continued results between salon visits, pair with the S.P.R. Home Care range (shampoo, conditioner, mask), sold separately. What is in the kit S.P.R. Shampoo, 1000ml, Step 0, Preparation Phase Protein Infusion, 1000ml, Step 1, Reconstruction Phase Seal & Protect, 1000ml, Step 2, Reconstruction Phase Acidic Closure, 1000ml, Step 3, Closure Phase, pH 3.5