We did some work with this but didn't realize that you have to use it all within 48 hours or it hardens. And it is really expensive. I looked at a smaller tube but it too hardens within 48 hours of opening. Is there anything that works well but can be used over and over, and weeks apart for small jobs? What do you do if you only have to seal a few holes for a new compass? I hate the idea of wasting the rest of the tube.