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I would not recommend using an acrylic paint on your lemon cypress trees, as it could potentially harm the trees and prevent them from growing and soaking up essential nutrients from the soil. Instead, you could try the following steps to promote healthy growth on the trees:

1. Remove any dead or dying branches, such as those affected by the over-trimmed areas. This will allow the trees to focus their energy on healthy branches.
2. Give the trees a deep watering once a week, preferably in the early morning. Check the soil with your fingers to make sure it's moist, but not soggy.
3. Consider applying a balanced fertilizer that contains all the essential nutrients the trees need. This will help support healthy growth and recovery.
4. Monitor the trees regularly for any signs of insect infestation, disease or other stress. If any issues are found, consult with a certified arborist for proper treatment.

As for hiding the over-trimmed areas, you could use a natural or artificial mulch around the base of the trees to disguise the bare spots. Additionally, you could consider adding a small rock garden or landscaping feature to draw attention away from the trees and toward a more visible area of the yard.