My hair is wavy but not that curly, I don't like it since I were small, I always prefer a layer cut with straight hair. I have done permanent straightening before but it gets back to my normal hair within a year because I didn't do treatment or whatsoever.

Now, i just have a haircut that I asked for layer hair, which turns out my hair is very messy now as it curls back. I don't plan for a permanent straightening anymore, but would like to do straightening at home by myself only if when I want to go out.

Do I need to apply serum or anything first before I use my temporary straightener so that my hair won't get damaged? And what to apply after I straighten it so that it won't be back to wavy hair if it got sweat or wind?