Out gassing on Museum glass

Bob Doyle

SPFG, Supreme Picture Framing God
Jul 14, 2002
South Berwick, Maine
I have a customer who insists I put glazing over an acrylic painting he has.
Because of issues with glare and lighting he wants TV Museum on it. I have UV on it now because I am worried about the painting outgassing and am concerned about needing to replace the glass in a year.
The painting is fairly fresh. </font>
  • Will outgassing get on the glass?</font>
  • Will I be able to wash it off a year from now when he brings it back in?</font>
  • Most importantly, Will it damage the coating?</font>
Of course.


Jury is out.

"customer who insists". . . customer is right. They get what they want. In a year or three, they will know if they were right.

If you have UV glass on it now... what is your problem with putting Museum on it?
expense, experience, easier to clean UV. Feel bad "wasting" Museum Glass if I think I may have to relace it a year from now.

I have this mental block towards Museum Glass. It's a bugger to clean, always have one blue fingerprint on the glass when I'm done cleaning it.

If I have to replace the glass a year from now then I don't have as big an aversion to throwing away UV, don't like throwing away museum glass! UV Glass gets broken up and thrown in the bin as soon as I cut it, I look at the Museum cut-offs and want to use them! But I have to admit that I was the same way when I first started using UV as the default, got over it quick when the scrap bin became unmanageable!
Especially if that's what the customer wants, do not hesitate to put Museum Glass on an acrylic painting. Acrylic paints are not like oil paints; they do not require months to set up and years to dry completely, so I doubt that offgassing would be an issue.

Of course an air gap of at least 1/8" should be provided, but if a little offgassing could occur from the acrylic, 1/2" would probably lessen its effect.

And in the worst-case scenario, if you have to clean the Museum Glass in a year or so, I doubt that the coating would be affected unless you use a damaging cleaner. The coatings are made to withstand routine cleaning. The Tru-Guard UV coating must go inside. I'm not sure, but I believe the anti-reflection coatings might be the same on both sides.

Why not call or contact Tru Vue through their web site and ask?
As acrylic emulsions dry, they deposit surfactants on their surfaces, during the first
few weeks. It is doubtful that you will see anything that fresh and as Jim said, also
doubtful that much will show up on the glass,
especially with proper spacing.

Thanks everyone! Customer went with the Museum, and will bring it in in six months for "follow up". Was very glad that I was concerned about possibilty of outgassing and left happy!

Feels good to have my own "consultants" to check in with!