[NSRCA-discussion] Thinning Hobbypoxy...?

[Gray E Fowler]

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> 
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04/12/2006 06:08 PM
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[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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