Gtechniq Crystal Serum Light ( CSL ) 50mlSwirl and chemical resistance Incredible gloss Up to five years of durability* Why Use Gtechniq Crystal Serum Light? Crystal Serum Light is the prosumer version of the world famous Gtechniq Accredited Detailer Crystal Serum Ultra. It offers 80% of professional Serum Ultras performance, but if applied incorrectly can be machine polished from your vehicles paintwork. When it comes to adding gloss, resisting swirls, contaminant and dirt repellency,
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