Good post, just wanted to add.. As Marks stated, if you scribe the left over epoxy [ assuming your like the rest of us and made to much.. and have some left in a cup] you should get a nice white line w/ some hardened epoxy powderish stuff, coming off on the tool you use to scribe. Kinda hard to explain but.. if it doesn't give you a white line its not curing in the cup either [ usually there is enough heat to cure in the cup even in cooler area's.]  Its not a garrentee but it's a place to start.  Also as other's have said you may need to de-crystalize your hardner or it may be out of date.

Jarrett

----- Original Message -----

From: Mark R Steitle <mark.steitle@austin.utexas.edu>

Date: Thursday, January 26, 2006 1:45 pm

Subject: [FlyRotary] Re: Epoxy

> John,
>
> Are you measuring the mix ratio by weight or volume?  From your
> post, it
> sounds like you're going by volume.  That could be the problem.  Also,
> what's the age of the hardener?  Is it still within the mfg's
> shelf-life
> period?  Did the remainder of the mix left in the cup cure, or is it
> still soft?  Its always a good practice to keep the residue and
> check it
> with a sharp object the following day, just to make sure it hardened
> properly.  Have you spoken with the manufacturer? 
>
>
>
> Mark S.   
>
>
>
> ________________________________
>
> From: Rotary motors in aircraft [flyrotary@lancaironline.net] On
> Behalf Of John Downing
> Sent: Thursday, January 26, 2006 1:16 PM
> To: Rotary motors in aircraft
> Subject: [FlyRotary] Epoxy
>
>
>
> Question for you glass fellows.  Yesterday I laid up some cloth on the
> cowl and it didn't harden.  I put some heat on it with the heat
> lamp and
> left it over night and nothing.  This morning I put the heat lamp
> on it
> and pulled it off, scraped it and ground the area, wiped it down again
> with acetone and tried again.  The epoxy is United Resin Corp. Uni-
> Lam.The shop is hot water heated with pipe in the floor and this
> epoxy is
> supposed to work at room temperature..The ratio by volume is 1 to 3.8,
> it has been working ok by using a marked stick in a soup can, but I'm
> wondering if this ratio is hyper critical.  Any input would be greatly
> appreciated.  JohnD
>
>