From: '''newspam'''@nonad.co.uk   
      
   On 06/11/2023 13:16, vjp2.at@at.BioStrategist.dot.dot.com wrote:   
   >     I always knew epoxy to be binary so the two components only need each   
   > other to harden and are not affected by air or water. I see many   
   > products marketed as epoxy which are only one component. And further   
      
   Cite?   
      
   Quite a few epoxy products these days like epoxy putty are still a two   
   part system but physically separated in concentric cylinders rather than   
   two tubes. You cut a bit off and mix it well to start it curing.   
      
   People were forever putting the wrong lid on each tube so the marketing   
   men came up with "simpler" to use alternatives at a higher price. The   
   dual syringe is another solution which also ensures the mix ratio is   
   right - that is another way Joe public screw up using epoxy.   
      
   > some of them admonish against wetness. Particularly for sealing   
   > leaking basement wall cracks, which even a blow torch after acid could   
   > not dry. What gives?   
      
   Epoxy won't stick to wet or greasy surfaces. There are high tack space   
   filling polyurethane glues that will though. Some of them require you to   
   wet the surface being glued first to enhance the curing reaction.   
      
   I think you are confused. It doesn't help now that there are daft   
   brandnames around that don't immediately translate into chemistry.   
   "Gorilla glue" being one such example.   
      
   ISTR it started out as a high tack PU glue and then diverged.   
   https://uk.gorillaglue.com/gorilla-glue-original/   
      
   --   
   Martin Brown   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)