Digital BW, The Print

I understand what you’re saying about one sided coating….. In all the
mounting I have done I have always coated both sides and used a slip sheet
between them to hand mount and / or put the job in a vacuum press.. The
exception to this is if I’m using a laminating film. Anyway Paul mentioned
3m 77 which actually works quite well. It is thinner in viscosity as it’s a
spray and the back side of canvas usually has a some texture to it.. So
another option is 3m’s general Purpose Adhesive CA which is not a spray and
you can brush or roll it on and it’s easy to fill the tooth on the back of
the canvas that way.  It’s pretty close to a non-spray version of the 77 per
3M.. I use that here a lot.. 

 

My favorite mounting method is vac / heat mounting using a film. That bonds
to both pieces using a vac / heat bond.. I can do up to  40x60 that way..
Also a laminating machine using heated rollers does well .. These bonds are
very strong yet flexible and in the case of canvas if the substrate and the
canvas shrink or expand at different rates it doesn’t matter as the bond has
some flex to it. 

 

As far as mounting canvas to any substrate (assuming the canvas has cotton
in it) the fabric will shrink and expand with humidity changes. You could
maybe encapsulate the job but to me that seems like a long walk.. Also as
far as epoxy’s and similar materials  they won’t stand the test of time ..
as they will crack and or discolor plus x-gas forever. 

 

Your suggestion of bonding stock to the back of the job should stop warping
also..  The hard part here is to figure out a process that makes sense for
each individual as our needs and volumes probably differ. I don’t think
there is any one right answer that works for everyone. 

 

j

 

 

 

 

From: DigitalBlackandWhiteThePrint@yahoogroups.com
[mailto:DigitalBlackandWhiteThePrint@yahoogroups.com] 
Sent: Monday, September 05, 2016 10:08 AM
To: DigitalBlackandWhiteThePrint@yahoogroups.com
Subject: Re: [Digital BW] Canvas & solvent-based adhesives

 

  

Hi both of you

 

Being a photographer (an a woodworker too) this "tacking" question relates a
lot whit what we call "surface tension". Any substrate used will warp if
only one side is coated; using a 3' x 6' (and 1 1/4" thick) wood panel, if
only one side is glued, let's say with Arborite, you will see the warping.
It can takes a week or a year depending on the conditions but… it will warp.

 

If you want to test some substrate. I would consider gluing a scrap piece of
the same material on the back of the mounting board to alleviate the effect.
That's why you see furniture (made with Arborite for example) having a
"backside" glued with a similar material to stop the warping.

 

Good luck

 

Jacques Caron

Photographe
jacques.caron@...



 

Le 2016-09-05 à 10:55, "Paul Roark roark.paul@...
[DigitalBlackandWhiteThePrint]"
<DigitalBlackandWhiteThePrint@yahoogroups.com> a écrit :



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