I am getting a lot of questions about how to use this expandable foam product for fence, mailbox and birdfeeder posts, so here is a demo. It’s called Sika PostFix, and I started using it a couple of years ago. It’s a a two-part, pre-proportioned polyurethane resin, good for use with wooden, PVC and steel posts. 👉IMPORTANT: You need to dig the hole to the proper depth, according to the size of your post and frost depths. When you place the post in the hole, it should be straight and level. If th