Epic is a must. It's your long-lasting protectant. It'll give solid protection for your paint for about six months, a little less or a little longer depending on your environmental conditions.
Banana Gloss is optional. It'll make your Epic last longer if you apply it every couple of months and it really adds depth to dark colors. For me, it has become a must.
Hydro is also optional. It's a spray on, and wipe off after you wash product. Again, it can add a small bit of protection to extend the life of your Epic. It will also hide some of the tiny micro-swirls and scratches in your paint in between your major detailing processes.
So, how many do you NEED ? Just one.
How many do you WANT ? Three.
