![]() The smallest crack or opening in clearcoat can allow water in and to the surface underneath. There are clear spraypaints and other paints that can be used to coat an ornament or other piece but none of these can guarantee safety. We’ve received many questions on what kind of clear sealers an aquarists can use to cover an unsafe material and make it suitable for use in a tank. Clear-coats – Clear-coat paints and “sealers” were some of the most popular materials in the questions we’ve received.Nail polish is an easy and inexpensive solution for touch-ups and quick fixes. They will never cure and will affect the water quality. Water-soluble glues – For obvious reasons, never use water-soluble glues like white craft glue in aquariums.Make sure the pieces are completely dry and clean and avoid using this glue in higher-temperature tanks. ![]() For quick fixes like re-attaching an artificial plant that may have become detached from a base, they are the easiest to use and are non-toxic and ready to use soon after applying. Hot Glue Guns – Hot glue guns are arts-and-crafts staples but are also surprisingly effective in aquariums, most especially in freshwater tanks. ![]() Avoid using epoxies that aren’t designed for underwater use or with toxic materials, especially before the epoxy has fully cured. These epoxies are more cement-like than other adhesives and are good for creating rockwork formations but not as effective for surfaces that need a thinner, more transparent adhesive. Underwater epoxies usually look like a putty with an outer coating over a contrasting center and are commonly found in white or a coralline-algae-colored purple.
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