Sign Plywood is known as MDO Medium Density Overlay plywood is used for signs in 1/2" or 3/4" thickness. MDO is made by bonding a resin impregnated paper to the plywood surface which improves resistance to checking and splitting. It is then primed & painted. (Regular plywood is not used for signs due to the rough grains). We have build wooden frames as large as 12H'x24W' for billboards.
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Intrepid Signs & Electrical 281-232-5262