[NSRCA-discussion] Thinning Hobbypoxy...?

Mon Apr 17 14:30:24 AKDT 2006

Gray..
    Thanks a bunch for your reply.  What you said makes perfect sense after reading it but I'm certain I will get better results now.  Have not tackled project yet so you were in time..  vbg..  Thanks again.

    Del
  ----- Original Message ----- 
  From: Gray E Fowler 
  To: NSRCA Mailing List 
  Sent: Monday, April 17, 2006 9:46 AM
  Subject: Re: [NSRCA-discussion] Thinning Hobbypoxy...?

  Del 

  Sorry for a late reply...was on Vacation. 

  DO NOT use rubbing alcohol. 
  I realize that many advocate this and swear it works but it is not a good idea. That 90% means 90% isopropyl and 10% water. Isopropyl is not an efficient 
  epoxy solvent and worse- water messes up the amine curing agents,,,badly. you will lose fuel resistance and make the cure soft and gummy. 

  IF there is no polystyrene foam (wing cores, some mfgs "core" fuse structure) then use acetone or methyl ethyl ketone (MEK). These are much better and will ensure total evaporation from a thin "fuelproofing" application. 

  If there is polystyrene foam then an alcohol must be used. Methyl alcohol is the best, but semi hard to find. Ethyl alcohol is second best and is usually called "denatured alcohol" which means it is100%  Ethanol with a nasty tasting additive (Everclear has water too). 

  Home Depot/Lowes has these solvents. 

  In any case no puddling and thickness build up allowed. 

  Also to improve the quality of Hobby poxy cure (the real slow cure stuff) Mix the epoxy and allow to sit in a mass (ex-a cup)for 15-30 minutes before thinning. 
  This epoxy has a polyamide curing agent that requires "induction" to ensure a really good cure.

  Gray Fowler
  Principal Chemical Engineer
  Composites Engineering 

        "Del K. Rykert" <drykert2 at rochester.rr.com> 
        Sent by: nsrca-discussion-bounces at lists.nsrca.org 
        04/12/2006 06:08 PM Please respond to
              NSRCA Mailing List <nsrca-discussion at lists.nsrca.org> 

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              Subject [NSRCA-discussion] Thinning Hobbypoxy...? 

  I have a Question? Does anyone know of of a thinner that would be acceptable to use to thin hobbypoxy to make it flow more freely to moisture proof..  Strength is not required. I do realize all the rules against thinning epoxy in normal use but looking to make it less viscous, besides using heat?  Thanks for your thoughts. 

                   Del 
           nsrca - 473 

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