11/16" Pourform 100/100 HDO Concrete Forming Plywood 4' x 8'Savona Pourform HDO panels produce a consistently smooth, glossy concrete surface, eliminating sugaring and minimizing finishing requirements. When manufactured, the panels are overlaid with a yellow colored high content phenolic resin impregnated cellulose fiber sheet. The overlay is bonded to the plywood substrate under high heat and pressure. This forms a hard, durable surface that resists abrasion and moisture and makes the panel easy to strip