Title line...Re: Reflector: EZ-Poxy Hardener

Sat Nov 12 10:31:39 CST 2005

Pleeze change subject  title if topic changes
 THANX   JC

Jorge Bujanda wrote:

> Yup.
> Very annoying, no doubt about it. But keeps you on your toes and once
> you get proficient... you probably can handle almost any kind of wind.
> I guess you really sharpen your crabbing and crosswind landings around
> here... and learn to tighten your seatbelts more too. You should fly
> this way more often though.
> Regards
> Jorge
>
>
> steve korney wrote:
>
>>
>> Jorge...
>>
>> It might be VFR 360 days a year, but don't forget to mention the
>> wind........
>>
>> Best... Steve
>>
>>
>>
>> ----Original Message Follows----
>> From: Jorge Bujanda <jbujanda at dslextreme.com>
>> Reply-To: Velocity Aircraft Owners and Builders list
>> <reflector at tvbf.org>
>> To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
>> Subject: Re: Reflector: EZ-Poxy Hardener
>> Date: Fri, 11 Nov 2005 12:17:40 -0800
>>
>> Thanks for the info Al.
>> My epoxy box temperature varies 10 to 12 degrees (or more) because I
>> have a difference of 30 to 35 degrees between day and night. My
>> garage room temperatures may go from the 100s to the 60s in a summer
>> day and 50s to the 20s in a winter day. Also, relative humidity may
>> vary 60 - 70% in 24 hours. Today, 95% at 4:00AM and 22% at 1:00PM.
>> Normally, it is very low here (desert). This doesn't help with the
>> hardener clogging the dispensing tubes. Just a nightmare to deal with
>> liquids here... but there are some good things too... like an annual
>> average of 360 days VFR conditions. No wonder they chose Edwards Air
>> Force Base as one of the prime locations for testing :-)
>> Plan:
>> Further insulate the box to maintain a lower and more stable
>> temperature.
>> Less material in the pumps
>> Cap the dispensing tubes.
>> Insulate the pump containers from the heatgun and heat dispensing
>> tubes every day, before use.
>> Heat new material before filling pump.
>>
>> Let's see how this works. Thanks again.
>>
>>
>>
>> Al Gietzen wrote:
>>
>>> I used my epoxy pump from early 1997 until just recently when I
>>> emptied it and flushed it with acetone because I expected to need it
>>> no more. During that 8 year period I never had to clean it, and it
>>> worked reliably.
>>>
>>> Other than when I was adding material to the pump, I would keep it
>>> sealed and at room temp. I had hardener in the containers for more
>>> than 2 years at times, and as near as I could tell by my qualitative
>>> ‘pull’ tests on samples the cured strength was fine.
>>>
>>> What worked for me was keeping the pump at a moderate temp, say
>>> about 70 F, and maintain the temp as constant as you can. Lower temp
>>> means less rapid loss of volatile components, and less oxidation of
>>> components. A constant temp minimizes the moisture entering the pump
>>> containers. I tried to keep the amount of material in the pump
>>> containers to what I expected to use in a few days to a week.
>>>
>>> If the pump had not been used for a period of time (and there may
>>> have been times as long as a year), and the hardener was getting
>>> stiff, or the resin plating out some of the ‘white’ stuff, I would
>>> heat the new materials in cans to about 105 -115 F before adding to
>>> the pump containers; then heat the pump cylinders with a heat gun
>>> until they were nice and warm to the touch; stir the materials in
>>> the containers, and pump a few strokes through the pump. The warm
>>> material would dissolve the crystals, and was a good ‘flush’ for the
>>> pump.
>>>
>>> It worked for me; your results may vary.
>>>
>>> Al
>>>
>>> -----Original Message-----
>>> From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org]
>>> On Behalf Of Jorge Bujanda
>>> Sent: Friday, November 11, 2005 6:16 AM
>>> To: Velocity Builder's Forum. Reflector
>>> Subject: Reflector: EZ-Poxy Hardener
>>>
>>> I've noticed that the EZ-Poxy hardener becomes grumous at the bottom of
>>>
>>> the container in the pump, even though the inside of the epoxy box
>>>
>>> maintains between 80 (night) and 90 (day) degrees. These grumes tend to
>>>
>>> dissolve with increased temperature and specially with stirring. The
>>>
>>> problem is, I need to unclog the pump, and go through the
>>>
>>> heating/stirring process almost every day. I have kept two unopened
>>>
>>> bottles inside the house since I got them with the kit and found they
>>>
>>> were in the same condition.
>>>
>>> If I expose the bottles to early morning sun to dissolve, will this
>>>
>>> damage the hardener? Is the hardener already bad and what is the
>>>
>>> cause? If I get rid of it, how do I keep this from happening to the
>>>
>>> new one?
>>>
>>> I welcome your comments. Thanks
>>>
>>> Regards,
>>>
>>> Jorge Bujanda
>>>
>>> XL FG (under construction)
>>>
>>> Palmdale, CA
>>>
>>> "Make your best case... not the best case."
>>>
>>> "Spare the noise... convince through silence."
>>>
>>> Website: http://members.dslextreme.com/users/jbujanda/
>>>
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>>
>>
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>
>
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