If you’re using double-sided tape, just tape the picture at the top two corners. If you’re using photo corners, lightly mark the corners of the picture using a pencil, and remove the picture. Stick photo corners on each corner of the picture, and line up the picture with the pencil marks you just drew. Close the window to make sure that nothing’s shifted; open the window, then firmly press down the corners.

There’s actually a third method you can use to attach your artwork to the mat board, using your acid-free hinging tape, that works well for pictures that are too big/heavy to use with photo corners, but that you’d still like to be able to potentially remove from the mat someday. With the image held in place (with this method, you’ll definitely want to weight it), carefully attach two short strips of tape (about 3") at the top of the image, sticky-side up, and in such a way that half the tape adheres to the back of the image, while the other half extends above it. Cut two more short strips of tape and use them to hold the first two strips in place against the mat board; just press them down so that they sit parallel and just above the top edge of the artwork. Fold down the remaining exposed bits of vertical tape, and stick them to the horizontal strips.

Close the window again and voila – you’re now the proud-owner of a beautifully-matted picture that’s now ready to be popped into its frame. 

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