A high-quality, flexible primer undercoat designed for exterior wood, boasting a proven durability of 10 years. This professional-grade undercoat serves as an ideal base for eggshell and gloss finishes. Formulated with solvents, it ensures superior adhesion to wooden surfaces and accommodates the natural movement of wood, effectively preventing and alleviating flaking and cracking. Sandtex Trade Flexible Primer Undercoat delivers excellent opacity when applied to exterior wood and joinery, including wooden doors, window frames, gates, fences, and other exterior timber surfaces.