Aquarium safe. Sinks, tubs, aquariums, plumbing, fixtures, widows & siding. 45 min. Silicone is the most universal of sealing common household joints and cracks that are subject to direct water contact. Loctite's indoor/outdoor formula withstands temperature extremes and adheres to a wide variety of materials. Cured formulation is aquarium safe. Conforms to ASTM D4236. www.loctiteproducts.com. Made in USA.