The 2-finger rule to apply sunscreen is not universally recommended, especially for Indian skin tones that already have melanin for protection. Experts recommend applying a pea-sized amount and reapplying every 2-3 hours, focusing on missed areas like ears and neck. Choose a broad-spectrum SPF 30+ sunscreen for your skin type and apply it 15-30 minutes before sun exposure. Reapply more often if sweating or swimming. Consider consulting a dermatologist for personalized advice.