Of course, tape is still the simplest and quickest way to attach, but you can also use liquid adhesive on a wig. There are 2 ways to do this - the messy way and the easy way.
The messy way is to apply the adhesive directly to the base. If the perimeter of your wig is Poly or ThinSkin (solid material), it will hold really well, but it's an unholy mess trying to clean it up.
The easy way is to apply Transpore single-sided tape to the base and then "paint" the adhesive onto the tape. When it's time to remove and re-attach, you just peel the tape off the base (along with the adhesive) and throw it away.