Whether you need to wash your hair after using sea salt spray depends on a few factors, such as how much product you used, how your hair reacts to the product, and your personal preference for how your hair feels.

Sea salt spray can leave your hair feeling a bit gritty or textured due to the salt content, which is part of the effect desired for creating beachy, tousled looks. However, if you find the texture too coarse or if your hair feels dry or stiff, you might prefer to wash it out at the end of the day or the next time you shampoo your hair.

For daily use, especially if you're using a lot of product, it's a good idea to wash your hair regularly to remove buildup from the sea salt and any other styling products. This will help keep your hair healthy and prevent it from becoming too dry or brittle. If you use sea salt spray occasionally, you might find that you don't need to adjust your regular hair washing routine significantly.

Remember to follow up the use of sea salt spray with conditioning treatments, as salt can be drying to the hair. Using a good conditioner or a hydrating hair mask can help maintain your hair's moisture balance.