If you get some of those precision little swabs. Just went it with tenax, then (holding two halves tightly together, that's important) touch it to the tightly closed seam. The tenax will be drawn into the seam. I don't recommend using the little tube thing. It will get tenax everywhere.

If the seam is airtight the tenax won't flow though... Ease off pressure if it doesn't work
It's only needs a wee little crack to flow.

There's a fine line between the parts not being tight enough, and too tight. It takes a few tries to get it right. I Generally find that at the pressure of just making contact is a good starting point.

I like to tilt the seam rather then in a level position as it does aid in proper capillary action.

You will get a glue stain where you touch the model. That's normal. Once dry, it's very easy to sand and polish out the seam.

My preferred glue is Tamiya Extra Thin. I really like the small applicator brush it comes with. If you're using a brush, you want a medium stiff bristle about a 1/4 inch in length. I find that the glue will run down hill about a inch at a time. So I plan accordingly. I also run the brush alone a seam like the leading and trailing edge of a wing. Clean up is generally very easy: #320, 600 both wet, then Micro Mesh pads or cloths 4000, 6000, 8000, & 12000.

Joel