is it bad for your binders? i have an underworks one just woundering

No, saltwater doesn't react with fabrics. (Chlorine may, depending on the particular fabric, so pools can be bad for clothes, but the ocean isn't.)

thank you

Oooh, good to know. In that case, I'll be bringing my binder with me to Myrtle Beach! 8D YAY!

The one thing I can see as a problem is the sand getting into the binder. I wore the double front and sand getting kicked up and going into the fabric did some damage to my binder.

I wore my binder in a salt water pool for like.. 7+ hours yesterday and it doesn't look or feel any different.