Epoxy hardening time . - FRETS.NET2024-03-28T14:43:15Zhttp://fretsnet.ning.com/forum/topics/epoxy-hardening-time?id=2177249%3ATopic%3A114220&feed=yes&xn_auth=noWell I got the old resin and…tag:fretsnet.ning.com,2013-08-16:2177249:Comment:1154502013-08-16T05:14:27.976ZLen Biglinhttp://fretsnet.ning.com/profile/LenBiglin
<p>Well I got the old resin and mixed in some new hardener , it worked fine , so Im saying the hardener goes weak over time ( 4 or 5 years) in my case .</p>
<p>Well I got the old resin and mixed in some new hardener , it worked fine , so Im saying the hardener goes weak over time ( 4 or 5 years) in my case .</p> I've had old resin & hard…tag:fretsnet.ning.com,2013-08-12:2177249:Comment:1152292013-08-12T21:44:14.632ZPeter Lainehttp://fretsnet.ning.com/profile/PeterLaine
<p>I've had old resin & hardener fail to react, but most of the time it's old sticky pumps that are the culprit.</p>
<p>For small amounts you can measure by weight on a gram scale. 206 is 5:1 by weight. </p>
<p> Just to add a small bit of info, Epoxy cures by molecular cross linking, it is very important to have the proper ratio or you will end up with extra resin or hardener molecules, the resulting resin is rubbery or won't go off, certainly does not have the physicals of…</p>
<p>I've had old resin & hardener fail to react, but most of the time it's old sticky pumps that are the culprit.</p>
<p>For small amounts you can measure by weight on a gram scale. 206 is 5:1 by weight. </p>
<p> Just to add a small bit of info, Epoxy cures by molecular cross linking, it is very important to have the proper ratio or you will end up with extra resin or hardener molecules, the resulting resin is rubbery or won't go off, certainly does not have the physicals of properly mixed resin.</p>
<p> When I used epoxy up in Mass, during the winter I made a base with a light bulb that kept the resin & hardener thin enough to pump</p> That good news Len!tag:fretsnet.ning.com,2013-08-08:2177249:Comment:1146262013-08-08T06:46:26.537ZJeff Highlandhttp://fretsnet.ning.com/profile/JeffHighland
<p>That good news Len!</p>
<p>That good news Len!</p> Good one Rusty ! Down there m…tag:fretsnet.ning.com,2013-08-08:2177249:Comment:1146242013-08-08T05:23:11.415ZLen Biglinhttp://fretsnet.ning.com/profile/LenBiglin
<p>Good one Rusty ! Down there must be freezing , its bad enuff here in Newy , Good news guys , I left the desk lamp on the LP all day which didnt fix it , but next morning it was hard ( after being cold all night ) I have found a source for new West Systems and wont be touching the old one again .</p>
<p>Good one Rusty ! Down there must be freezing , its bad enuff here in Newy , Good news guys , I left the desk lamp on the LP all day which didnt fix it , but next morning it was hard ( after being cold all night ) I have found a source for new West Systems and wont be touching the old one again .</p> JR,
You do not want that - be…tag:fretsnet.ning.com,2013-08-08:2177249:Comment:1145972013-08-08T00:56:58.356ZRussell Vancehttp://fretsnet.ning.com/profile/RussellVance
<p>JR,</p>
<p>You do not want that - be very careful what you wish for - I have to take a heat-gun to the urinal.</p>
<p>Rusty</p>
<p>JR,</p>
<p>You do not want that - be very careful what you wish for - I have to take a heat-gun to the urinal.</p>
<p>Rusty</p> Oh... and please send some of…tag:fretsnet.ning.com,2013-08-07:2177249:Comment:1142732013-08-07T23:20:46.968ZJ R Emmetthttp://fretsnet.ning.com/profile/JREmmett
<p>Oh... and please send some of that cooler weather along. It is bloody HOT here in Texas (105F today)!</p>
<p>Oh... and please send some of that cooler weather along. It is bloody HOT here in Texas (105F today)!</p> Good synopsis of epoxy issues…tag:fretsnet.ning.com,2013-08-07:2177249:Comment:1144592013-08-07T23:18:07.491ZJ R Emmetthttp://fretsnet.ning.com/profile/JREmmett
<p>Good synopsis of epoxy issues Gregory. I'll offer a few comments based on my experience (Repair, Woodworking and a few decades in Microelectronics/MEMS packaging):</p>
<p>1. I wouldn't necessarily assume it's just the hardener. Typically, both parts are purchased at the same time and should be tracked in age (and discarded) together as Gregory noted.</p>
<p>2. Surface Preparation is a frequent root cause of adhesion failure. Contaminants on the surface (including other adhesives) can…</p>
<p>Good synopsis of epoxy issues Gregory. I'll offer a few comments based on my experience (Repair, Woodworking and a few decades in Microelectronics/MEMS packaging):</p>
<p>1. I wouldn't necessarily assume it's just the hardener. Typically, both parts are purchased at the same time and should be tracked in age (and discarded) together as Gregory noted.</p>
<p>2. Surface Preparation is a frequent root cause of adhesion failure. Contaminants on the surface (including other adhesives) can inhibit Epoxy cure. In particular, oils and waxes will cause loss of adhesion and strength. Cleaning the surfaces with Naptha or Acetone is a good idea (when possible). However, if the contaminant has really soaked into the wood - there may not be a way to get it out. </p>
<p>3. If solvents are used to clean the surface, allow sufficient time for them to evaporate. Application of epoxy to a solvent wetted surface often produces unexpected results.</p>
<p>4. High temperature storage conditions can accelerate chemical aging. I tend to keep my Epoxy materials in temperature controlled spaces.</p>
<p>5. Epoxy adheres well to most bare wood. It may or may not adhere well to a smooth finish and you are now depending on the finish adhesion to the bare wood as part of the joint. Bare wood joints generally work best.</p>
<p> </p>
<p>Best of luck with your repairs. </p> That'll be an expensive repai…tag:fretsnet.ning.com,2013-08-07:2177249:Comment:1145412013-08-07T18:59:58.730ZRobbie Collinshttp://fretsnet.ning.com/profile/RobbieCollins
<p>That'll be an expensive repair that fails after a few hours!</p>
<p></p>
<p>That'll be an expensive repair that fails after a few hours!</p>
<p></p> Oh, I was just waiting for so…tag:fretsnet.ning.com,2013-08-06:2177249:Comment:1143642013-08-06T18:14:01.111ZMike Kolbhttp://fretsnet.ning.com/profile/MikeKolb
<p>Oh, I was just <em>waiting</em> for someone to post that! Ka-boom! </p>
<p>Oh, I was just <em>waiting</em> for someone to post that! Ka-boom! </p> Thanks for that Greg , I real…tag:fretsnet.ning.com,2013-08-06:2177249:Comment:1145122013-08-06T17:41:00.048ZLen Biglinhttp://fretsnet.ning.com/profile/LenBiglin
<p>Thanks for that Greg , I really do feel its the hardener thats at fault , but as it did go half way hard , I hope a little heat will finish it off . If not I will sprinkle it with Viagra powder !</p>
<p>Thanks for that Greg , I really do feel its the hardener thats at fault , but as it did go half way hard , I hope a little heat will finish it off . If not I will sprinkle it with Viagra powder !</p>