What should never be used on nails that have recently been polished?

The use of acetone on nails that have recently been polished should be avoided because acetone is a strong solvent that can strip away nail polish and damage the underlying nail. When nails have just been polished, they need time to fully set and cure, and introducing acetone can dissolve the polish and affect its longevity as well as the finish. This is particularly important to consider because using acetone too soon can lead to a streaky or uneven appearance, and can inhibit the nail polish's ability to adhere properly.

In contrast, using soap and water, nail oil, or a base coat is generally safe for polished nails since these products do not contain harsh solvents. Soap and water can help clean any residue without affecting the polish, nail oil can help maintain hydration and shine without disturbing the polish, and a base coat generally serves to protect the nail, enhance adherence, and improve the overall finish of the manicure.