We understand that because the shipping agent did not say that the chemical product can not be shipped beforehand,thus we declare the customs with the price for chemical product.Regarding the overcharge,we can duduce it in the next shipment,please be assured. We understand that because the shipping agent did not say that the chemical product can not be shipped beforehand,thus we declare the customs with the price for chemical product.Regarding the overcharge,we can duduce it in the next shipment,please be assured.