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Is HDO or MDO plywood better for concrete forms?
For projects requiring 20+ reuses per panel or an exposed concrete finish, HDO is the better choice — its denser phenolic overlay (45+ g/m²) delivers 30–50 reuse cycles and near-mirror concrete quality. For 15–20 cycle projects where concrete will be painted or clad, MDO saves 30–50% on upfront panel cost while still outperforming standard plyform.
What is the difference between HDO and MDO plywood?
The core difference is overlay density. MDO uses a lighter resin-fiber overlay at 20–30 g/m², producing a smooth paintable surface with 15–25 reuse cycles. HDO uses a denser phenolic overlay at 45+ g/m², creating a harder, more abrasion-resistant surface that delivers 30–50+ cycles and a near-mirror concrete finish. HDO costs 30–40% more per sheet but has a lower cost per pour on high-cycle projects.
How many times can HDO plywood be reused for concrete forming?
HDO plyform typically delivers 30–50+ reuse cycles with proper site practices — applying release agent before each pour, cleaning promptly after stripping, sealing cut edges, and storing flat off the ground. Premium 220 g/m² film-faced panels from Vietnam manufacturers offer equivalent reuse performance at 20–35% lower cost per sheet.
Can you paint MDO plywood?
Yes — MDO's resin-fiber overlay creates an excellent paint base, making it popular for both concrete forming and signage applications. The surface accepts latex and oil-based paints without priming. HDO plywood has a harder, glossier surface that is more difficult to paint, so MDO is the better choice for applications where painting is planned.