Picture Framing and Art Preservation/Mounting metalic prints


l have recently mounted a metalic print on a board and l have noticed that there seems to be moisture appearing inside the glass.
The product used was Boyle spray adhesive for bonding and mounting photos to backing boards.
l have used this product many times with normal photographic paper and have not had any problems.
We do not live in a major humid climate.
Could the problem be caused with the adhesive not being left to dry long enough before framing?. On this occasion the print was framed within a few hours of mounting to the board.
The back of the paper is sealed with professional tape to make it completely air tight.
Your help in the matter would be greatly appreciated.

Hi Michael,

I think there are two possible causes of your problems, and there's a chance that two or more issues are working against you.

First, did you use mats or spacers to provide seperation between the glass and the photo? When a slick, glossy surface is pressing against the glass, sometime "wet spots" can appear. These are not actually caused by moisture, but it looks exactly like there are patches of water in the frame. They disappear as soon as the glass is seperated and leave no lingering effects. It's an easy fix but a maddening problem if you don't know what's going on.

A second cause could be offgassing from the photo as the inks cure; this will show up as a hazy film on the glass. It won't cause any long-term harm and can be cleaned from the glass easily. To avoid this in the future, it's a good idea to let any digital (not traditional) photo cure for at least a week before framing.

Relating to the offgassing, there's a chance that the spray adhesive and its solvents caused a reaction with the photo which in turn caused offgassing. It's hard to say, given the complex chemistry involved and the many different possible combinations. Personally I don't care at all for spray adhesives, but if you continue to use them you should give them plenty of time to cure, a day at least.

Hope this helps you track down the issue and avoid it going forward. Please feel free to follow up if you have any other questions.  

Picture Framing and Art Preservation

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David Lantrip, MCPF, GCF


I can answer questions about all aspects of framing, with special emphasis on preservation framing. Categories of artwork include works of art on paper, needlework, textiles, paintings on canvas and three-dimensional objects. Components of framing includes frames, glass/glazing, mats, mounting, their features and how to select them.


I have been a professional picture framer and educator in the field since 1994, including framing education for a major franchisor encompassing three brands and the Professional Picture Framers Association, and writing and teaching for DECOR Magazine.

Professional Picture Framers Association (PPFA) > Board member, PPFA > Member, Certification Board > Member, Chapter relations Committee National Society, Sons of the American Revolution (NSSAR)

DECOR Magazine, 2005 - 2010 PPFA For Members Only newsletter Member of the PPFA Guidelines task force, assisted in writing PPFA Guidelines for Framing Works of Art on Paper and PPFA Guidelines for Framing Works of Art on Canvas, and PPFA Guidelines for Framing Textiles and Needlework. Picture Framing Magazine, 2012

Georgia State University, many classes as a student and educator through the Professional Picture Framers Association and DECOR Magazine. Current member of the PPFA guidelines task force and certification board.

Awards and Honors
Earned Certified Picture Framer (CPF) designation in 1996, Master Certified Picture Framer (MCPF) designation in 2004 and Guild Commended Framer (GCF) status in 2008.

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