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Answer: Applying a Jotun primer—such as Jotun Ultra Primer or Majestic Primer—is essential for three reasons: it creates a strong bond between the substrate and the paint, it blocks alkaline substances from damaging the finish, and it improves the color consistency of your topcoat. Skipping the primer often leads to peeling paint, patchy colors, and the need for extra coats of topcoat.