Sanding molding can be pretty challenging with all the curves and details. First for sanding curves try wrapping your sandpaper around a piece of dowel rod. Choose the proper sized dowel for the size of the curve that you have to sand. The larger the curve the larger the piece of dowel that you will need. To get into hard to reach crevices try folding the sandpaper several times and then use the edge of the sandpaper to sand down in the tight crevices.