Postsaver Pro-Set Post Fixing Foam | Quick and 23 cm x 23 x 4 cm, Grey\nProduct Details\n--Quick and Strong Alternative - Postsaver Pro-Set Post Fixing Foam is a rigid post setting foam that's 97% lighter than concrete & 100% laterally as strong. It's a convenient substitute to traditional concrete post mix, making installation a lot easier with no water required.\n--Easy to Use - Simply shake this fence post foam in the bag for 60 seconds & pour around the post in the hole. No water needed! In 3-5 minutes, it'll start to expand & harden until it reaches its full load strength in 90 minutes. Easily cut excess away or backfill during expansion to prevent foam egress.\n--Strong Posts - This post fix concrete foam provides equal performance to concrete post mix. Posts set with Pro-Set are able to withstand high winds and exceed the lateral strength of concrete post mix.\n--Lighter & More Eco-Friendly - One pack of Pro-Set expanding foam post mix installs 2 posts (when us.