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Have heard of Dan Strebin, large collector? didn't know he conserved and backed posters.
1- can't imagine mounting a poster to anything other than a firm/stable surface; first to mount, then to restore any issues. Isn't "unprimed" canvas the same as "washed"? I may be confused/uninformed.
2- have never heard of anyone using a "cold vacuum press". sounds revolutionary! I wonder why more don't use it. Can only imagine a "vacuum press" is quite expensive.
@Charlie might be able to shed more light on this.
My approach since i'm early in my development, keep it simple.... and master the basics....
What weight of Masa paper should we use？Are the Masa paper and poster attached to the canvas at the same time or paste the poster after the Masa paper is dry？Thank you very much
How to overcome the shrinkage after poster drying