Friendly reminder. There are a number of posts here that discussed the use of oxytetracycline as a marine antifoulant paint additive. Be advised that in 2005 such used were cancelled by the USEPA. To add the compound, veterinary drug sourced or what have you, to marine antifoulant paint could be interpreted as a violation of FIFRA. Procede with due dilligence.
"Use of oxytetracycline as a marine anti-foulant additive for barnacle control was cancelled in 2005."
Oxytetracycline Summary Document
Registration Review: Initial Docket
Case # 0655