Attach sheet of hardboard to back side with glue to stabilize frame.
Temporarily tape corners to secure backing while turning.
Apply Caulk to Frame
Run a bead of caulk around inner edges of message board and fill in any gaps between joints. Let dry two hours.
Protect Hardboard Surface
Apply painters’ tape along edges where hardboard meets frame. Cover hardboard with masking paper. Tape in place.
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