Yes, you can add wax after the cure time.
Any wax can work, but we highly recommend taking a look at our CarGuys Hybrid Wax.
Hybrid Wax is a spray sealant infused with carnauba wax. It's a quick spray-on, wipe-off product that can be used as a stand-alone wax/sealant or as a topper for what you are wanting to do.
You can finish your whole car in about 15 minutes because it is safe to spray onto every part of your vehicle including plastic and rubber trim.
Each of these products can be used on their own, but they work best and were actually formulated to be used together.
We have had unmatched results in terms of longevity and shine when applying our hybrid wax over the top of our liquid wax.
It can be used after every car wash to enhance and extend the life of the Liquid Wax.
And of course, if you have your own favorite wax such as a carnauba paste wax, those will work excellently too :)