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I sponged the edges and set them aside . I used Scotch tacky adhesive and applied a generous amount ( not too much , not too little ) to the front on the frame , lined up the cardstock and gently pressed it to the frame . Allow a few minutes to dry .

What may have happened before I did this ?
Select from: -- I attached it to the frame .. -- I sponged the edges .. -- I put it on the wall .. -- I found cardstock I like ..
I found cardstock I like .