Re: Which surface to use to create large format collage?
Hi, Andy, and welcome to WetCanvas. I assume you want this collage to be a permanent work. (You can always reprint the images for future use.) I hasten to confess I have only dabbled in collage and so you may want to cross-post this on the mixed-media forum.
As to glues--you want something that glues, seals, and finishes the assemblage, and I recommend acrylic gel medium. It's good for the rough surface of canvas as well as paper. Any paper you use will of course will be acid-free to prevent it yellowing.
As to support, you have three main concerns: it should be stable enough to support the art, not swell or cup when it absorbs water from the medium, and not leak acids or formaldehyde into the art adhered to it. There are some specialty products like gatorboard that are archival but pricey. I have used baltic or finnish plywood (google/shop for suppliers near you for a standard 4x8 sheet). (These products have a much smoother surface than regular plywood.) I double-coat both sides and all edges of the panel with acrylic medium. By coating all surfaces at the same time you minimize cupping and bowing. The acrylic medim also prevents leeching of any acid or aldehydes from the support into the work--hence the double coat.
Hope this helps. Good luck, and please post a photo of your finished work on this thread so we all can see it!
Last edited by wsrea : 02-25-2012 at 12:29 PM.