But they blend not as good as wax base one bro ?!?

There are several brands on the market. Be sure you pick one that is meant for colored penci or dry media. There are basically two types:Workable fixative and Final Fixative. Workable Fixative will still allow you to adjust the work while still preventing smudging or bloom. A final fixative is meant to be exactly that–you’re completely done and you want to seal your drawing. Several light layers of workable fixative will still set your pencil well enough. Some people use hair spray, but hair spray is meant for hair and may contain ingredients that might cause discoloration, and even degradation of pigments and paper. Do some research about which fixative brand will work best for you.