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If you choose to grind them flat, the quickest and most aggressive way to do it is 120 grit on a glass plate. I even got lucky at the glass business - they had unclaimed thick glass that they just gave me. This is also fairly cheap in terms of supplies and
time.</div>
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You could even get some wet/dry sandpaper at a hardware store. </div>
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Chris Tacker, Ph.D., P.G.
<div dir="auto">Research Curator of Geology</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Nhcoll-l <nhcoll-l-bounces@mailman.yale.edu> on behalf of Robert Waller <rw@protectheritage.com><br>
<b>Sent:</b> Wednesday, January 11, 2023 10:32:06 AM<br>
<b>To:</b> James Maclaine <j.maclaine@nhm.ac.uk>; nhcoll-l@mailman.yale.edu <nhcoll-l@mailman.yale.edu><br>
<b>Subject:</b> [External] Re: [Nhcoll-l] Putty For Sealing Jars</font>
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<p class="x_MsoNormal"><span lang="EN-CA">Hi James,</span></p>
<p class="x_MsoNormal"><span lang="EN-CA">Not a complete answer, but something you might want to check on. Your mineralogy or geology prep labs might have equipment for grinding perfectly flat surfaces (for them, in advance of polishing). If so, they could
quickly and easily grind your jar tops flat for you. If they don’t have the equipment then they may be able to point you to someone who does. A vibrating lap (<a href="https://urldefense.com/v3/__https://kingsleynorth.com/16-inch-covington-vibrating-lap.html__;!!HYmSToo!cYC3fw02i6vOpwFSOFOihSZnnAskFr7aSQRQFKPe4wTf_bXCK9J9zyEa81-x2ZLzL2MyX_FWil_yAo8GUzjBjquo0p_uSA$">https://kingsleynorth.com/16-inch-covington-vibrating-lap.html</a>)
might be ideal but even a rotating flat lap (<a href="https://urldefense.com/v3/__https://arrowheadlapidarysupply.com/products/18-rotating-disc-flat-lap-model-18rl/2695/)*20would__;JQ!!HYmSToo!cYC3fw02i6vOpwFSOFOihSZnnAskFr7aSQRQFKPe4wTf_bXCK9J9zyEa81-x2ZLzL2MyX_FWil_yAo8GUzjBjqvgqfe_0w$">https://arrowheadlapidarysupply.com/products/18-rotating-disc-flat-lap-model-18rl/2695/)</a>
would serve.</span></p>
<p class="x_MsoNormal"><span lang="EN-CA">Whatever you choose to seal with, the a perfectly flat jar top is certain to improve the seal.</span></p>
<p class="x_MsoNormal"><span lang="EN-CA">Rob</span></p>
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<p class="x_MsoNormal"><b>From:</b> Nhcoll-l <nhcoll-l-bounces@mailman.yale.edu> <b>
On Behalf Of </b>James Maclaine<br>
<b>Sent:</b> Wednesday, January 11, 2023 7:09 AM<br>
<b>To:</b> nhcoll-l@mailman.yale.edu<br>
<b>Subject:</b> [Nhcoll-l] Putty For Sealing Jars</p>
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<p class="x_MsoNormal"> </p>
<p class="x_MsoNormal"><span lang="EN-GB">Dear all,</span></p>
<p class="x_MsoNormal"><span lang="EN-GB"> </span></p>
<p class="x_MsoNormal"><span lang="EN-GB">Happy New Year!</span></p>
<p class="x_MsoNormal"><span lang="EN-GB"> </span></p>
<p class="x_MsoNormal"><span lang="EN-GB">Hope someone can help with a large jar sealing question. In the past we have used a kind of putty (made by Arboseal) to seal flat glass plates to the top of some of our largest jars and containers. This was especially
useful in the case of some of the older jars where the top is not completely flat and the putty could fill in the gaps. It isn’t an ideal solution (and makes opening the jar a bit of a chore) and in some cases the putty has hardened and cracked but on the
whole it has fairly effectively slowed down evaporation over several decades. </span></p>
<p class="x_MsoNormal"><span lang="EN-GB"> </span></p>
<p class="x_MsoNormal"><span lang="EN-GB">However, in the cases where the old putty has to be replaced I can no longer find the same brand for sale online, so can anyone tell me where I can purchase something similar and reliable that I could use for this?
Or ideally, let me know of a better way of sealing a flat lid on an uneven jar top (please don’t suggest stretching parafilm over it!).
</span></p>
<p class="x_MsoNormal"><span lang="EN-GB"> </span></p>
<p class="x_MsoNormal"><span lang="EN-GB">As these are large containers for specimens that would be difficult to find alternative storage for (see attached), I’d like to keep using them if possible. They would also be prohibitively expensive to replace.</span></p>
<p class="x_MsoNormal"><span lang="EN-GB"> </span></p>
<p class="x_MsoNormal"><span lang="EN-GB">Any suggestions would be much appreciated.</span></p>
<p class="x_MsoNormal"><span lang="EN-GB"> </span></p>
<p class="x_MsoNormal"><span lang="EN-GB">Cheers,</span></p>
<p class="x_MsoNormal"><span lang="EN-GB"> </span></p>
<p class="x_MsoNormal"><span lang="EN-GB">James</span></p>
<p class="x_MsoNormal"><span lang="EN-GB"> </span></p>
<p class="x_MsoNormal"><span lang="EN-GB"> </span></p>
<p class="x_MsoNormal"><span lang="EN-GB"> </span></p>
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