When installing CA hinges, I use an old Xacto blade, touch the point to the hinge, and put the drops on the flat part of the blade. They run down into the hinge just fine. I feel I have better control of the glue that way.

The alcohol you want for thinning is not isopropyl, it has too much water in it - read the label and you will see. Use the paint thinner alcohol, up to 50% t o thin with. I use balsarite to seal with. There are 2 types, one for fabric, and one for film. I use the one for film, since that is what my planes are covered with.