The frame of the 30" x 40" mirror is made of rope moulding glued onto a pediment. We spray-painted all the moulding before cutting it. The finished mirror measures 38" x 48".
Steps
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Cut a panel of 38" x 48" from the MDF and seal it with a coat of primer on both sides. Leave to dry.
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Apply a coat of gold spray paint to both sides of the panel.
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Centre the mirror on the MDF panel and draw around its edges. Remove the mirror.
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Apply numerous dabs of silicone across the back of the mirror, then stick the mirror onto the MDF panel, lining it up with the pencil marks.
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Using wood glue, affix the rope moulding to the pediment moulding along the flat channel between the two bulges. Leave the glue to dry.

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Next, paint the moulding with the gold spray paint and leave to dry.
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From each length of moulding, cut one piece 38" long and another 48" long.
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Bevel the ends of each piece at a 45° angle.
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Position the mouldings around the mirror and adjust the corners.
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Glue the moulding onto the MDF panel with wood glue.

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Any paint touch-ups can be made with a cotton swab or small brush dipped into a little paint sprayed onto a piece of card.
Fasten the mirror to the wall using suitable picture hooks. Since the mirror is heavy, the screws should be attached to the wall studs.