The Gorilla Glue Company has introduced Gorilla Glue Single Use tubes of their polyurethane glue. The Gorilla Glue Single Use tubes come in packs containing four 3-gram tubes. Once fully cured, the Gorilla Glue polyurethane is 100-percent waterproof and completely nontoxic; it won't break down with moisture and is unaffected by extreme heat and cold. A pack of four Gorilla Glue Single Use tubes sells for $5.25.