Fast 2K Fence Post Backfill is super lightweight and forms a waterproof barrier that extends the life of wooden posts. This foam is also strong enough to resist lateral force of more than 500 lbs. and has the compression strength three to four times that of tamped soil. And it doesn’t need to be mixed with water. You just pull the clip that separates the two components, mix the bag for 30 seconds and pour the liquid down the hole. The post/pole will be ready for use in just 15 minutes!
