Clean and Assemble the Frame
Pull the dual point tabs out of the back of the frame using pliers.
Clean the glass, using Invisible Glass and the lint-free cloth. It might be necessary to clean the glass two or three times.
Measure the interior of the frame and cut the self-adhesive spacers to fit snugly inside the edges of the frame. Use a ruler to measure the spacer length and mark it with a Sharpie pen. Score the plastic spacer with your wire cutter. Take the spacer in both hands and snap it at the scoring. Remove the self-adhesive backing and position the spacers on the glass as close to the frame edges as possible. Press the spacers firmly into the glass to help them stick. Avoid gaps between the spacer ends at the corners.
Before you start assembling the frame, give everything another once-over with canned air and double-check to make sure all dust and dirt have been removed.
Press the artwork into the frame. The backing board will come into contact with the spacers. Then press in the second piece of backing board in place.
Use a dual point driver and fresh dual point tabs to hold the boards in position. Don't try to reuse the old tabs. Press the driver down on the spacers and then into the frame.