Secure Set - 20 Post Kit - Commercial Grade -4 Gallons.  Fast, Secure & Safe Concrete Alternative for Easy Fence Post Installation. Commercial grade ! double the strength of any other product on the market! Our proprietary formula works with wood, metal, vinyl, pvc, concrete and fiberglass posts. Set it and forget it, secure set is designed to be and extremely fast!!! No water, no mess, no heavy bags, mix, pour and done. Secure set is 10x's faster than traditional use of concrete for fence post installations.