To determine if your concrete needs to be resealed, you can perform a simple water droplet test. Sprinkle a few droplets of water on the surface of the concrete. If the water beads up and does not soak into the concrete, then it is still sealed. If the water is absorbed into the concrete, it may need to be resealed.
thanks for sharing the water droplet test. It sounds like a simple and effective way to determine if resealing is necessary.