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Mounting boards warping

Elliot Burg

Grumbler in Training
Joined
Mar 8, 2017
Messages
1
I've been displaying 16 x 20 photographs dry-mounted onto rigid boards called Eco Boards from Kool Tack. With that system, the photos are easy to mount and trim. There's no frame, mat or glass--nothing between the viewer and the image. On the back, I've epoxied D-rings, with West Six-10 epoxy, to which I've attached fishing line to hang the photos from picture molding at my show venue.

They look great ... except that the boards/photos have begun to bow slightly from the top. It's not the epoxy, which is highly stable, according to West. Does anyone have any idea as to what the problem may be, and how to fix it?

Eternally grateful,

Elliot Burg
Middlesex, Vermont
 

Jim Miller

SPFG, Supreme Picture Framing God
Forum Donor
Joined
May 19, 2000
Messages
17,857
Explain more about what you mean by "bow slightly from the top". Can you post pictures?
 

Dave

SPFG, Supreme Picture Framing God
Joined
Jun 11, 2004
Messages
13,347
I'd call and talk to Len Lastuck at Frame Specialties about the issue. They are the manufacturer/distributors.

800-777-3165
 

Daniel Smith

True Grumbler
Joined
Nov 27, 2015
Messages
50
You are putting pressure on the back that is not even. The weight of the mounted image pulls in the direction the image is hanging from.
Probably need to put a stiffener on the back between the hangars to keep the board stiff so it does not bow on you.
 

charming

True Grumbler
Joined
Feb 4, 2009
Messages
66
I used Kooltak for photos because of the lower mounting temperature than tissue, and I always placed a 1/2" MDF board on top of the inverted work when I took it out of the press. That eliminated a lot of bowing.

However, I switched to LJ's Mountcore which is a denser foam core. Ideally I would use a Kooltak Mightycore if available,
 
Vermont Hardwoods solid wood picture frame molding

artfolio

SGF, Supreme Grumble Framer
Joined
Feb 16, 2007
Messages
2,654
A lot of substrates will bow when an image is blockmounted onto the front, even 10mm mediium density fibreboard if given a few years and bit of humidity. I have been told that as the adhesive cures it exerts an inward pull which eventually causes bowing.

One "fix" I have heard of but never tried is to mount something else of similar density like a bit of blank photographic paper on the back to offset the "pull" on the front.
 

wvframer

Humble Picture Framer
Forum Support Team
Forum Donor
Joined
Oct 9, 2007
Messages
1,685
Mounting a similar material on the back has worked great for larger posters that were not going into a frame. With the information you have provided, I think that might work for this application. But I agree with others that a denser board would help.

And I would call Len about this problem. He is usually glad to discuss how his products are used, and he also listens well to his customers and has developed new products in the past to meet our needs. Not meaning to give him a commercial, but I have found him very receptive and helpful.
 

Jim Miller

SPFG, Supreme Picture Framing God
Forum Donor
Joined
May 19, 2000
Messages
17,857
Ideally I would use a Kooltak Mightycore if available
Kool Tack applies their adhesives to lots of substrates, including Gatorfoam and MightyCore. If your favorite distributor does not stock these, maybe you can request them.
 

preservator

SGF, Supreme Grumble Framer
Joined
Mar 23, 2001
Messages
2,208
If the photos are on paper, that paper can warp plastic substrates. I have seen 4ply board warp Dibond. One plastic that might resist warping is Stinger Board, from Coroplast, but its edges would not be attratcive. Sheets of metal, glass, or ceramic should resist warping, but each presents problems.
 
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