Things You'll Need
Instructions
There are no standard sizes for reflectors; you may cut the piece of cardboard into any sizes you want. An ideal size for holding is about 24 by 32 inches. If you want a big reflector that is more portable, you may lightly score and fold the cardboard in half.
Cut out a piece of tin foil that is slightly larger than the cardboard. You may need to cut two or more pieces to cover a larger cardboard.
Spray a thin coat of adhesive on the cardboard.
Carefully apply tin foil on the cardboard, shiny side up. You may overlap the tin foil pieces slightly so that all surfaces are covered.
Fold the excess foil over the edges and tape it down. For smoother edges, cut the excess foil and trim the edges with masking tape.