Hello Overcut, Scarfinger has you on the correct path - here is an alternative plus more details.
These types of posters are cheaply mounted usually with a polyester laminate also known as "menu laminate" - as per menus in restaurants. Cheap, but efficient. If you mount them with a product like Seal or Techmount heat activated drymount tissue they may appear to be adhered. However the plastic will soon start to lift from the tissue and simply lifting a corner will peel the entire work from the substrate.
You can try a couple of things. One is to use a contact spray adhesive in a can from 3M. It is called High Strength 90 Spray. This is no different than contact cement in a bottle or can if you prefer to use that. You need to spray both surfaces and then carefully roll the laminated print out on the substrate and use a brayer or roller to apply pressure to adhere the plastic.
The second is to take it to a company that specializes in laminating large digital print output. They will be able to do mounting with a cold rolled adhesive product like
SEAL Print Mount One in a 40 or 60 inch wide roller press with the heat turned off. They will apply the Print Mount One adhesive cold to the back of the substrate or to the laminated print. This leaves the glue applied to the material, but with a cover of release paper over the outer side of the adhesive. It is then sent through the press a second time while the release paper is pulled back and the rollers squeeze the laminated poster to the substrate.
Unless you want to experience the fun of contact cement I recommend the service bureau
route. If you have already contact cemented new kitchen counters with formica then go for it and do it yourself!
You can find info about 3M products at the following.
http://www.3m.com/product/index.html
http://www.3m.com/product/index_A/index_A_74.html
Alan Sturgess
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Accent Art Distributors Ltd
40 East 60th Avenue, Vancouver Canada, eh!
"The Retailer's Wholesaler, Not the Retailing Wholesaler."