Thing its been posted earlier in the thread. Buy in small units since as offered it does not have a long shelf life once opened. In addition ones exposed to the air the brush attached to the lid and other parts of the metal can will start rusting even in low humidity areas of the country. I always remove the brush once I open so that it does not rust and sit in the adhesive. Believe this alters the color and look of the adhesive if you use it a second time. Also over time started to, once its open, move the left over adhesive to small glass jars to minimize the amount of air in the container and reduce the contact to metal surfaces. It has helped me.