Please read the instructions carefull before applying.When you use new or indiscernible materials,or under special condition(like dealing with suspended roof,the arc)or the temperatuer is below 10℃,application experimentation or being guided by engineers and technicians is adviseable before you decided to use.Storage life:Its quality can be guaranteed for 1 years at room temperature(The date of its production is marked on the lid).If it does not go bad beyond this period,adhesive can be used continuously.