I am using two billboard liners 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. I know the online source that sells them, says you must place ad side down, but the ad will mostly be covered up by the rafts and the colors will mostly only show on the top 8" of block and slightly on the sides. It's much lighter in color (blues, yellows, red etc), so will be a lot less heat absorbing then the black side and kind of looks fun.
We layed them in today, then my husband said to me tonight that he wonders if anyone will have a problem with it. Surprisingly, there's no offgassing smell typical of vinyl. I am guessing that is the result of being exposed to the elements.
Does anyone know if the dyes used to make them have any metals in them?