Can Skeepon be used after damage due to drought and heat has occurred?

Yes, you can use it when signs of stress appear, but if the plant is already damaged due to overstress, it may be difficult to see an effect or it may not work.
It is recommended Skeepon be used as soon as possible after the plants start to show signs of damage due to dryness and heat. (Continuous watering is recommended after 12 hours of application of Skeepon.)
If the plant is severely damaged, the product may kill the damaged plant.