Fast 2K vs Sika composite foam! Concrete alternatives for post-installation have advanced far in the last few years in the form of foam. Fence post or building post, one foam product, in my opinion, should not be on the market. Watch and see as we put these composite foam products to the test. We bought all the products in this video. I am sure one manufacture is definitely not going to like us after this video. | Tony's Tractor Adventure Homestead