A better pole barn part 4. Join us as we use Fast2K post-setting foam instead of concrete. This is a two-part epoxy foam that is stronger than concrete and encapsulates the post keeping them from rotting. Fast2K is an amazing product. I can't find anything I don't like about it. Just amazing! It is perfect to set structural posts, fences, and to help repair loose posts where the concrete has broken down. Fast2k: www.fast2k.com