hey mate the flo coat will leave smells through your product unless you rinse it sufficiently but best check before just using any paint or fiberglass products. the tanks on boats made of fiberglass and flo coat generally are ice boxes and the fish (on larger scale boats) are processed afterwards the fresh water tanks after just being done smell and taste of fiberglass for a while. just finished using a product on a fresh water tank for a steel boat. it is a wattyl product called TL 710 im pretty sure can check it out other wise your local wattyl dealer should be able to direct you towards the right variation of the product. WARNING its not cheap