ho a 3D WALL PANEL INSTALLATION GUIDE X x 1. WA Ill SURFACE PREPARATION All the basic wall surfaces must be flat, dry. clean, and firm. Aged wall surface must be painted with water-based seal primer to fix the loosen surface 2. PREPARATION FOR THE COMMODITY Open the box, put the panels on the floor for 24 hours to balance the moisture between panels and environment. to prevent excessive expansion or contraction after installation{Remark: put PCs in one stack, take out the panels carefully and gently) 3.