Cortina Wall Stickers Decorate Your Home Just In Minutes. Wall Sticker Application Instruction Our Wall Decal Application Instructions Will Make It Easy For You To Apply Your Wall Decals. The Surface You Wish To Attach Your Decal Must Be Clean And Free From Dust Grease Or Any Other Contamination. Simply Peel Those Pre-cut Pieces Of Wall Stickers Off From Backing Paper And Apply Them On The Desired Area.