Polecrete lets you set and secure poles and posts in as little as 15 minutes. Environmentally safe and easy to use, Polecrete works in any ground or soil condition and saves workers time and labor. Polecrete is available in a full range of kit sizes, from 2.5 cubic feet to 10 cubic feet, suitable for any size hole and application. The Sika 33 fl. oz. bags won't fill large holes or anchor 6x6 poles. It doesn't have anywhere near the compression strength of concrete. I am of the opinion that setting the post into concrete has a high probability of permitting the post I base this on close to forty years of being called out to fix them.