hello, well the cost of the materials to be used are quite minimal, i don't think we could all detail our cars that day anyways so we might just be doing some panels on different cars so chemical costs won't be that significant, if everyone's gonna detail their cars 3 step with clay and all with sealant and wax then maybe he would charge since the chemical costs would be too high already but since its a quick lesson it not that expensive hehe don't worry





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