You can use a mixing stick but you need the gun to get it out!!!. If I am going to use only a small amount, I will not use the nozzel, just push out a small amount and mix it with a stick. You need to be sure that both parts start to flow at the same time. Push out a bit onto some paper till they do and then put it onto the mixing tray. I guess you could push something into the back of the tube instead of using the gun but it would be messy.

also if you get the gun you can use the nozzels and apply the stuff very accuratly as advertised.