I am having problems gluing up my miter joints on picture frames. During the test fit using a band clamp, the miters are perfectly closed, and with pretty strong clamp pressure there is no frame deformation or twisting. For the glue up I use tite bond III and rub a thin layer of glue on each miter edge with my finger and this takes about 2 minutes to get them all 8 edges done. Then I add the band clamp and carefully pull the joints together, about another 1-2 minutes. In the end, there is a very slight gap in some of the joints, I assume due to glue film. The gap is uniform so the problem does not seem to be with miters that are 0.1 degrees off one way or the other. What is the preferred way to glue these joints? A different glue? Just coat one side of each joint? Glue 1 or 2 joint first and dry fit the others during clamping, then come back and glue them?