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Epoxy Finishing Resin?

Old 12-02-2007, 11:34 AM
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fuelman8
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Default Epoxy Finishing Resin?

I sealed the inside of my Deep Vee about 24 hours ago. I used 2 part Great Plains resin.

The resin is still a little sticky.

Have I messed up or does it take a long time for it to dry completely?
Old 12-02-2007, 11:58 AM
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Square Nozzle
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Default RE: Epoxy Finishing Resin?

After 24 hours I would expect that the epoxy resin should be tack free. I don't use anything but West Systems epoxy on my boats so I'm not familiar with the mix ration on the product you have. Sounds like you may have used the wrong resin to catalyst ratio. Let it sit for several days and see if it eventually hardens. Patience will sometimes cure poor mix issues.
Old 12-02-2007, 01:26 PM
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Default RE: Epoxy Finishing Resin?


NOTES FROM OUR TECH DEPARTMENT

This is Great Planes Pro Epoxy Finishing Resin. This Epoxy is used when
fiberglassing or fuel-proofing a kit. The resin and hardener must be mixed
together and applied. The working time is 45-50 minutes so there is plenty
of time to work the resin into the fiberglass. It will cure in about 3 hours
with a full cure in 24 hours. Also, there's no unpleasant odor or waxy buildup.

INCLUDES: One 4.5oz bottle of Resin
One 4.5oz bottle of Hardener
One Set of instructions

REQUIRES: For fuel proofing just mix and apply to surface. If fiberglassing
3M 77(MMMR1990) will be required to make the fiberglass stick before
the actual resin is applied. For mixing use cups, brushes or sticks.

COMMENTS: This will be best used to fiberglass wings, fuselages, and to make
fiberglass cowls along with fuel-proofing engine compartments.


Old 12-02-2007, 06:53 PM
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fuelman8
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Default RE: Epoxy Finishing Resin?

It has hardened just fine but it had a tacky feel to it. I used 2oz cups calibrated cups to mix it in so the ratios were right.

It's now 30 hours and most of the tackiness is gone now. I sanded in a spot and it dry and smooth underneath.
Old 12-02-2007, 09:29 PM
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Default RE: Epoxy Finishing Resin?

I've had similar problems with that stuff. In the future use ZAP Finishing Resin. Never had a problem with it curing out and it's not real sensitive to mix ratio. I just eyeball it and it always cures out dry.
Old 12-02-2007, 10:20 PM
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Default RE: Epoxy Finishing Resin?

I have noticed if epoxy sits for a year or so after opening and develops a darker color, the longer it takes to cure, and does form a soft skin on top but that goes away and is hard underneith like you found out.

Fresh epoxy does cure better than old stuff.
Old 12-03-2007, 04:56 AM
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Default RE: Epoxy Finishing Resin?

These were brand new bottles. I need to get some more to finish the rest of the boat so i'm going to toss the Great Plains and try the ZAP.
Old 12-03-2007, 07:37 AM
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Default RE: Epoxy Finishing Resin?

Good plan fuelman. I have grown to like the ZAP Finishing resin. I use it when I put fiber glass cloth on my airplanes. Good stuff, cures well and sands beautifully. I don't know where these rebranded products come from that the major hobby distributers push on the modelers but my experience has been --- it's garbage.
Old 12-03-2007, 07:56 AM
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Default RE: Epoxy Finishing Resin?

Great Planes finishing resin is thick and sticky. The LHS sells a much better version. I too have been dissapointed by the GP resin.
Old 12-03-2007, 01:27 PM
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Default RE: Epoxy Finishing Resin?

I e-mailed GP this AM and am curious what they think the problem might be. I was thinking maybe it had passed it's shelf life.
Old 12-03-2007, 04:03 PM
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Default RE: Epoxy Finishing Resin?

Is it really sticky? Or kind of greasy-waxy?
Epoxies can develop an "amine blush" on the surface, kind of like the feel of the wax that forms on polyester resin. It can be scrubbed off with soapy water.
Also try letting the boat sit somewhere nice and warm overnight...

Pat Matthews
[link=http://www.amazon.com/exec/obidos/ASIN/0615166954]Mahogany in Scale[/link]
Get the perfect fiberglass finish on your Chris Craft!
Old 12-03-2007, 07:27 PM
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Default RE: Epoxy Finishing Resin?

I am familiar with the amino blush. This stuff stays sticky. You can let it sit for days, and stuff will still stick to it. The blush can be removed by sanding then wiping with solvent.
Old 12-04-2007, 04:50 AM
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Default RE: Epoxy Finishing Resin?

It's been more than 2 days and it's still slightly tacky.
What type of solvent would I use after sanding?

Thanks for the replies[8D]
Old 12-04-2007, 05:07 AM
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Default RE: Epoxy Finishing Resin?

Acetone on a rag would probably work. (fingernail polish remover)
Old 12-04-2007, 09:41 AM
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Default RE: Epoxy Finishing Resin?

Rubbing or denatured alcohol also work and don't discolor some plastics like acetone does.
Old 12-05-2007, 04:50 AM
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Default RE: Epoxy Finishing Resin?

Got an answer back today from Great Planes and used a hair dryer to set the top layer. It worked just fine, but I am going to use the Zap to finish the outside of the boat as I am very particular of how my paint job turns out.

Thanks for all the input
Old 12-11-2007, 05:28 AM
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Default RE: Epoxy Finishing Resin?

Giving credit to Great Planes, they're sending me another set of resin FREE as they think it may have been an out of date batch I was sold.
Old 12-11-2007, 12:53 PM
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Default RE: Epoxy Finishing Resin?

Great Planes did a good job taking care of you! Good to hear that Fuelman.

They seem to be a company that has got very large without loosing its upkeep or support, and thats always good to see.
Old 12-16-2007, 10:18 AM
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Default RE: Epoxy Finishing Resin?

The new set came in and I used it on the hull. It dried perfectly tack free.

The hardener was much lighter than the first set so I assume that the set I got from Tower was past it's shelf life.

Thanks for all the tips to get me through this.

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