Bleeding is an unsightly surface discoloration commonly found on exterior wood surfaces and hardboard siding, ceilings, repainted wallpaper, or when light colored paint is applied over dark colored paint. The causes of bleeding are moisture and water soluble dyes located within wood surfaces and wallpaper, and inadequate priming of surfaces. Bleeding on hardboard siding is caused by wax. The removal of any excessive water source is essential before any surface preparation can be completed. Exterior wood surfaces should be primed with top quality alkyd based primers and finished with top quality acrylic latex paints. Interior surfaces should be primed with either a top quality alkyd based or acrylic latex based stain blocking primer, and finished with top quality acrylic latex finish paint.