Modpodge or fabric spray glue for shade?

I have a very dark bedroom with one window. I have a room darkener shade I pull way up to the top daytime and a window valance curtain that darkens the room again.
I have a beautiful piece of fabric I want to glue to the shade to get rid of the valance. Does Modpodge dry hard? It needs to be flexible. How about Fabric spray glue? Flexible enough? I have both. Thanks !

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