Iron the poster until the wrinkles aren’t noticeable or are no longer there. When ironing, try placing a towel or other thick fabric on the poster as a barrier between the iron and the poster. Hanging ...

Open up the poster, place between the two flat & heavy objects, and let gravity do the rest.<BR><BR><BR>Alright, so getting two such pieces of steel may be an issue, but you could go get a peice ...