Joint compound in corners
I live in a double-wide mobile home. Of course like any mobile home, I have strips of one 1/8 inch by 1 inch strips of wood about every 3 to 3.5 feet covering up the joints where the dry wall comes together. I am in the process of removing all the strips and putting joint compound on them to smooth out my wall and painting. Self tought and looks pretty darn good. My question is... I am unable to get the corners looking smooth and nice. Some of my walls have anywhere from a 1/4 inch gap to a 1/2 inch gap under strips. Whatever company put my home together cannot measure. One corner from inside wall to outside wall had one inch gap. And there is not a straight line anywhere.I have used all the drywall tapes available and still am unable to get my corners defined. Is there a special corner tool out there or is there a special trick. If anyone can help me I would greatly appreciate any advice. The only other choice I am able to come up with is to put corner-round molding in corners to make it look better.