I used  two billboard/banner vinyls to line the "raceways/raft tanks" and was wondering if anyone knew if it would be a problem (in terms of dyes leaching or poisoning the water) to use the printed side up.   Does anyone know if they have any metals in the inks or what type of ink is used and the process? I've googled it but didn't get specific info needed. I also  put a call in to the manufact…