them too thin? Should I do more coats?
A. - Depending on the porosity of the concrete, some will soak up more sealer as where some will require less. As you have 2 coats down, now look at it overall from a cosmetics viewpoint. Is it smoothed out overall or does some areas look more dry than others? If you have a good even smoothness everywhere then you should be fine with what you have down and can go forward with the final step of waxing. If it's not smooth and even
everywhere and overall, then go ahead with another coat of sealer.