Write an article based on this "Measure to center your artwork on the backing. Check your centering by laying down your window. Use a weight to keep your artwork in place. Tape the back of your art to the backing. Use photo corners or mounting strips to attach your artwork. Attach the window mat by creating a taped hinge."
Place your artwork on the backing and measure the space on each side. You should have the same amount of blank space above and below the artwork, as well as on the left and right sides of the piece. Make small pencil marks in the corners on the backing to record the right spot. It's a good idea to make sure your centering looks right with the window on top of the artwork. This will give you an idea of what your final, matted piece is going to look like. Take a minute to enjoy it before you get back to work. Now that everything's centered, it's time to start attaching all the pieces to one another. Use something heavy, like a sock filled with coins or a heavy glass, to keep your artwork where you want it. Don't worry too much if it shifts, though, since you've made marks to keep track of the centering. Use linen or archival tape to create what's called a hinge to attach your window to the backing. Put two pieces of tape in vertical lines on each side of the back of the piece, so the sticky side doesn't touch the backing. Lay two more pieces of tape horizontally across the vertical pieces (sticky-side down) to adhere the artwork to the backing. Linen and archival tape has the adhesive ability of regular tape, but it won't damage your artwork or mat board. It'll cost more than normal tape, but regular household tape contains acids and other chemicals that may eventually leak onto your artwork. If you're using corners, take off the bottom adhesive and place four of them on the backing at each corner of the piece. For see-through mounting strips, use two on each side of the piece, or eight total, and adhere them to the backing. You can then slip the artwork directly under the corners or strips. Photo corners and strips are best for conservation, as they avoid the damage that even linen tape could cause to your piece. Lay down the window and the backing flush against each other, with the window face down. Use one long strip of linen tape to connect the window to the backing. Place the tape so one half is on the back of the window and one half is on the backing. Fold them together like you're closing a book. It's best to connect the window and backing at the top of the frame. You're now ready to put this matted print into a frame if you'd like a more finished look. You can also attach an adhesive picture hanger to the back of your backing board to hang the matted frame up on the wall by itself.