[rebel-builders] primer curing time

[Bob Patterson]

Hi Ben !

You could try keeping the epoxy & hardener in the fridge until
ready to use - might slow things a bit ... and maybe use just a
smidge less hardener, as long as well mixed. If they are large
sheets, maybe you could lift part way through to add the epoxy
to the rest of the sheet ....

FWIW, I would stay with the PolyFiber Epoxy ...

--
......bobp
http://bpatterson.qhealthbeauty.com
http://apatterson2.qhealthzone.com

-------------------------------orig.-------------------------
On Friday 21 July 2006 10:52 pm, bransom@dcsol.com wrote:

I wonder if there is a way to spread on epoxy just before joining parts
without it curing before the parts are all riveted up.

Generally I haven't been too fussy about this because the joined parts keep
air off the epoxy and mostly keep it from drying (curing). But it is a
limitation on larger assemblies that take awhile, and even more so now with
the hotter weather. Any solutions? BTW, I've been using EP-420, but just
called to get info on Sherwin Williams stuff others mentioned here in the
archives.
-Ben

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[Ken]

I wouldn't worry about it Ben. Truthfully a great number of my joints
were not very wet by the time the rivets went in. I figure any strength
I happen to get from the epoxy is a bonus. As long as both sides were
painted I think I also got most of the anti-corrosion benefit even if
the joint is not as full of epoxy and as watertight as it could be. Some
of the joints that were assembled fully wet took weeks to reach full
strength and were almost impossible to separate without doing damage if
I tried to take them apart later.

Epoxy is a different animal than fiberglass resin. It depends on an
exact ratio of mix to fully harden. Less hardener will lower the
strength. Thinning makes it easier to spread but didn't seem to slow
the drying time. In fact the resultant thinner coating seemed to dry
faster for me.

Ken


bransom@dcsol.com wrote:

I wonder if there is a way to spread on epoxy just before joining parts
without it curing before the parts are all riveted up.

Generally I haven't been too fussy about this because the joined parts keep
air off the epoxy and mostly keep it from drying (curing). But it is a
limitation on larger assemblies that take awhile, and even more so now with
the hotter weather. Any solutions? BTW, I've been using EP-420, but just
called to get info on Sherwin Williams stuff others mentioned here in the
archives.
-Ben

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[eric.r]

Take care with adjusting catalyst ... I understand that less hardener means
faster cure time when using epoxy. Check with a chemist.
On 7/21/2006 6:33 PM, beep@sympatico.ca wrote to rebel-builders:

->
-> Hi Ben !
->
-> You could try keeping the epoxy & hardener in the fridge until
-> ready to use - might slow things a bit ... and maybe use just a
-> smidge less hardener, as long as well mixed. If they are large
-> sheets, maybe you could lift part way through to add the epoxy
-> to the rest of the sheet ....
->
-> FWIW, I would stay with the PolyFiber Epoxy ...
->
-> --
-> ......bobp
-> http://bpatterson.qhealthbeauty.com
-> http://apatterson2.qhealthzone.com
->
-> -------------------------------orig.-------------------------
-> On Friday 21 July 2006 10:52 pm, bransom@dcsol.com wrote:
-> > I wonder if there is a way to spread on epoxy just before joining parts
-> > without it curing before the parts are all riveted up.
-> >
-> > Generally I haven't been too fussy about this because the joined parts
keep
-> > air off the epoxy and mostly keep it from drying (curing). But it is a
-> > limitation on larger assemblies that take awhile, and even more so now
with
-> > the hotter weather. Any solutions? BTW, I've been using EP-420, but
just
-> > called to get info on Sherwin Williams stuff others mentioned here in the
-> > archives.
-> > -Ben
-> >
->
->





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