While it's possible to score existing concrete, it may be more challenging and may not produce the same results as scoring new concrete. The existing concrete surface needs to be prepared properly to ensure good adhesion for the scoring marks. Factors like the age and condition of the concrete will also influence the outcome.

Yes, concrete scoring and design can be used for both indoor and outdoor spaces. For outdoor spaces, consider factors like weather conditions and exposure to sunlight, which may affect the durability and appearance of the scored concrete.

Concrete scoring and design itself doesn't require any specific maintenance. However, to protect the scored surface and maintain its appearance, it's recommended to seal the concrete with a suitable sealant. This will help prevent stains, weathering, and fading.