<div dir="ltr"><div dir="auto"><div>Dear Nate,</div><div dir="auto"><br></div><div dir="auto">I'm very late to this party, but most of the frustrations you're experiencing can be fixed by not using the brush-bottle combo. We prepare B72 in glass bottles and dip brushes into it to make repairs. Closing the bottle right away is key as well, to avoid rapid evaporation. Another thing I do is work "by feel," meaning that if my concentration is 38% or 46%, as long as it gives me the consistency I need, it's ok. Concentration matters most when you're consolidating vs labeling vs adhering, but for most repairs, some deviation from the percentage (as long as it's the consistency you want) won't be the end of the world.</div><div dir="auto"><br></div><div>Finally, I have made the cleanup of my brushes for these repairs very easy by using pump dispenser bottles. I pump the acetone, dip the brush, clean it with a kimwipe, repeat until clean (and dispose of kimwipe in solid solvent waste). I use much less solvent this way and it prevents people from leaving brush cleanup for later, which also prolongs the life of the brush. Sustainability!</div><div><br></div><div>Hope this helps,</div><div>Mariana</div><div><br></div><div data-smartmail="gmail_signature">Mariana Di Giacomo, PhD<br>Natural History Conservator, Yale Peabody Museum<br>Associate Editor, Collection Forum, SPNHC<br></div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, May 6, 2024, 04:13 Fabian Neisskenwirth <<a href="mailto:info@naturhistorische-konservierung.de" target="_blank">info@naturhistorische-konservierung.de</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><u></u>
<div>
<p>Dear Nate,</p>
<p>I know its a bit of a late response. <br>
Have you tried different solvents than acetone (pretty aggressive
and super volatile). Paraloid B72 can be dissolved in ethanol as
well. You can use a wide variety of solvents actually, depending
on what you want to work on of course. A magnetic stirrer will be
useful, since some solvents takes a wile to dissolve the pellets.
For many of the purposes I use it, my solvent of choice is ethyl
acetate.<br>
</p>
<p>Hope this gives you a wider view on the use of the resin. <br>
</p>
<p>all the best from Germany,<br>
</p>
<div>Am 01.05.24 um 19:29 schrieb Shoobs,
Nate:<br>
</div>
<blockquote type="cite">
<div>
<div>
<p class="MsoNormal">Hi all,</p>
<p class="MsoNormal">I use <span>Paraloid</span>
B-72 to repair shells that have been broken, and to prepare
shell surfaces for labeling in cases where the material
doesn’t hold ink well.
</p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">While the repairs it makes are beautiful
(often I can’t even tell that the shell was broken in the
first place), a great frustration of using B-72 is how messy
it can get, and how quickly the solvent evaporates (which
changes the concentration).
</p>
<p class="MsoNormal">I have the resin pellets and mix up new
B-72 in acetone, and currently we apply the B-72 with little
brush-bottle applicators supplied by University Products
with their pre-mixed paraloid.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">However, it only takes a few uses before
the threads on the brush-bottles get
<span>gunked</span> up, requiring acetone and
a lot of grip strength to reopen.
</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Is there any clever solution for this?</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Also -- has anyone tried “fineline
applicators” with b-72 before?</p>
<p class="MsoNormal">Best,</p>
<p class="MsoNormal">Nate</p>
<p class="MsoNormal"> </p>
<div>
<p class="MsoNormal"><span style="font-size:9pt;font-family:Arial,sans-serif">--</span></p>
<p class="MsoNormal" style="line-height:13.5pt;background:white"><span style="font-size:9pt;font-family:Arial,sans-serif;color:rgb(51,51,51)"><img style="width: 2.3333in; height: 0.4687in;" id="m_7887039425245227984m_5616566735937566529Picture_x0020_1" alt="The Ohio State University" width="224" height="45"><br>
</span><b><span style="font-size:9pt;font-family:Arial,sans-serif;color:rgb(187,0,0);background:white">Nathaniel
F. Shoobs</span></b><span style="font-size:9pt;font-family:Arial,sans-serif;color:rgb(51,51,51)"><br>
Curator of Mollusks<br>
</span><span style="font-size:9pt;font-family:Arial,sans-serif;color:rgb(187,0,0);background:white">College
of Arts & Sciences</span><span style="font-size:9pt;font-family:Arial,sans-serif;color:rgb(51,51,51)">
Dept. of Evolution, Ecology, and Organismal Biology<br>
Museum of Biological Diversity, 1315 Kinnear Rd,
Columbus, OH 43212<br>
614-688-1342 (Office)<br>
</span><span style="color:black"><a href="http://mbd.osu.edu" rel="noreferrer" target="_blank"><span style="font-size:9pt;font-family:Arial,sans-serif;color:rgb(5,99,193);background:white">mbd.osu.edu</span></a></span></p>
</div>
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<br>
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<div>-- <br>
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