Proven effectiveness. SN-1 is the only copper and TBT free alternative antifouling paint. Formerly only available for use by government agencies, ePaint SN-1 is now EPA Registered for use on commercial vessels. Do not apply ePaint SN-1 over soft ablative coatings or unprimed metal. Prime with EP-Prime 1000 or EP-Prime 2000 prior to application of ePaint SN-1. Use EP-13 Thinner for thinning and clean up.