Wow, we have had the same problem with smearing ink.  When we asked UP about
it they said they had never heard of anyone else having that problem.

We use Sakura Pigma Micron 05 and Koh-I-Noor rapidograph pen with ultradraw
ink.  We releazied that the rapidograph ink is "waterproof for paper" so we
thought that might be some of the problem.

It is not uncommon for us to let the bottom coat of B-72 dry for 24+ hours
then let the ink dry for 24+ hours and still have problems with the top coat
smearing the ink.  And there just seem to be so many possible factors
(humidity, thickness of the B-72, thickness of the ink) that most of the
time we feel the only option is to cross our fingers and hope for the best.

As far as using the B-72 for an adhesive, we have recently done this with a
lamp globe that we will have on exhibit for about a year.  You literally
can't tell where it has been "glued" back together.  We did a test spot on
it before the exhibit opened to make sure that it would not mmiss up the
tinting on the glass and it came off easily with acetone (which also did not
mess up the glass) and it is a very strong bond as well.

Heather Marie Wells


>From: jmarks <[log in to unmask]>
>Reply-To: Museum discussion list <[log in to unmask]>
>To: [log in to unmask]
>Subject: B-72 problem
>Date: Tue, 29 Jun 2004 09:23:47 -0400
>
>Hi,
>
>I bought Pigma Micron pens from University Products, and had trouble
>with the B-72 wiping away my numbers, after what I thought was a
>reasonable drying time.  Someone told me that pigment pens don't adhere
>to the B-72 (or acrylic in general) - sorry that I don't remember the
>source.  I haven't found a solution, but sidestepped the issue by
>printing the numbers on paper then adhering the paper to the object.  I
>learned about it on this list, you can check the archives for more
>information.
>
>I believe the B-72 is meant to be very thin, for numbering purposes.
>You can use it as an adhesive when it's thicker.  Has anyone else heard
>this?  (I also have the problem of the acetone evaporating over time,
>even when I thought the bottle was tightly sealed, but the B-72 can
>easily be reconstituted with more acetone.)
>
>John Marks
>Geneva (NY) Historical Society
>
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