I just finished staining a wooden shelf I built. I assembled all the parts with glue and brad nails before finishing it and then I found it a little harder to get into the corners to stain than I thought it would be. I solved it with the tip of a slotted screwdriver inside the staining rag but I'm sure it won't always be that easy to get to the inside corners if I build anything larger with enclosed spaces. Also, if I was to apply any brush on finish I'd have to be extremely careful not to get it on the adjoining panels with the brush in the corners. So how do you do this?? The only way I can think of is to finish the parts before assembly but then if that's how you do it then what about wood glue adhesion to the finished surfaces??