Caulking failures causes - filling too large an opening. Wrong type of caulk for particular applications and exposure. Aged non-acrylic caulks that dry out lose their adhesion and flexibility. Considerable movement or prolonged contact with water will need special caulks/ sealants.
Caulking solutions - select a caulk that best serves your situation. Apply according to directions. For most interior painting, 100% acrylic caulks are recommended. They will seal cracks and adhere to most surfaces, even when moisture is present. Don't paint over silicone caulks.
Primers and Interior finishes - Priming is essential for best adhesion, sheen uniformity, mildew control and durability. Ask your Muralo dealer for the best Muralo interior paint for your project, in the color and sheen of your choice.