Choosing a long-lasting blush stick involves a careful consideration of several factors. Here's a step-by-step guide:

1. **Skin Type:** Understanding your skin type is the first step. If you have oily skin, go for oil-free or matte blush sticks. For dry skin, creamy blush sticks with hydrating ingredients like hyaluronic acid or vitamin E would be a better choice.

2. **Ingredients:** Look for blush sticks with long-wear ingredients. Silicones, for example, are often used in makeup for their ability to resist water and sweat, thus prolonging the wear of the product. Natural waxes like carnauba or beeswax can also enhance the staying power of the blush.

3. **Pigmentation:** Highly pigmented blush sticks tend to last longer as they adhere better to the skin. However, ensure the color is suitable for your skin tone.

4. **Brand Reputation:** Opt for brands known for their long-lasting makeup products. Look for reviews and ratings online to get a sense of the product's performance.

5. **Application:** The way you apply your blush can also affect its longevity. Applying it on top of a primer or foundation can increase its staying power. Also, setting it with a powder can help it last longer.

6. **Packaging:** Look for blush sticks with airtight packaging to prevent the product from drying out, which can affect its performance over time.

Remember, it's essential to patch test any new makeup product to ensure it doesn't cause any adverse reactions. Also, always remove your makeup thoroughly at the end of the day to maintain healthy skin.