Mixing Brands of Epoxy

Problems, how to use. Also see: "EPOXY", in the left-hand column of the Home page.

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dioxinman52
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Mixing Brands of Epoxy

Post by dioxinman52 » Wed Dec 12, 2012 8:06 pm

So last weekend I ran out of Glen-L Resin but had a bit of slow hardener left. I also had a bit of West 105 resin left over but no hardener. So I mixed up a small batch at the 5:1 ratio of resin to hardener and used it to glass a small piece of scrap. It hardened up perfectly. I then used it to make epoxy putty to glue the skeg on my Minimax. It worked great. I wouldn't recommend it as a general practice but it worked in an emergency. The key seems to be mix it using the right proportions for the hardener. Anyone else tried this?
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jcallends
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Re: Mixing Brands of Epoxy

Post by jcallends » Thu Dec 13, 2012 7:32 am

Guess you got lucky on the hardening but what you don't know is the physical and chemical properties of the mix and what is going to happen over a period of time. I would never do this for those reasons.

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Roberta
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Re: Mixing Brands of Epoxy

Post by Roberta » Thu Dec 13, 2012 9:54 am

I agree. You just don't know what the long term affects will be.

Roberta
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dioxinman52
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Re: Mixing Brands of Epoxy

Post by dioxinman52 » Sun Dec 16, 2012 3:32 pm

I got my fresh epoxy in (all Glen-L) and made putty to fillet both sides of the skeg yesterday. The right side hardened and the left was still mushy this morning so I scraped it off and made a new batch. I can't figure out why one side would harden and the other not when they were from the same batch. The side that hardened was closer to the heater but the garage was at 68 degrees.
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Gayle Brantuk
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Re: Mixing Brands of Epoxy

Post by Gayle Brantuk » Tue Dec 18, 2012 9:35 am

Probably because it was closer to the heater. I think I would have applied heat to the uncured side or just waited...

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Bill CNC
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Re: Mixing Brands of Epoxy

Post by Bill CNC » Tue Dec 18, 2012 1:57 pm

dioxenman52,

NEVER EVER mix different brands of epoxy and use it for anything structural. The real scarey part is that you will sell this boat to some poor guy and he takes his family out on the boat and the thing starts falling apart while in the water, or worse yet, ... while underway.

A Disaster waiting to happen! :shock:

before you get any further along, ... you really should correct the issue if not for the buyer years down the road, but for your OWN safety.

I don't mean to sound harsh, ... but there are REAL dangers in play here.
Bill
Bill

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pauloman
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Re: Mixing Brands of Epoxy

Post by pauloman » Mon Apr 01, 2013 8:18 am

if it hardened up fine not to worry. As good or better than the right resin with the right hardener mixed a bit off from the correct mix ratio.

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Bill CNC
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Re: Mixing Brands of Epoxy

Post by Bill CNC » Mon Apr 01, 2013 10:27 am

pauloman wrote:if it hardened up fine not to worry. As good or better than the right resin with the right hardener mixed a bit off from the correct mix ratio.
Not even close Paul, ... not even close.
Bill

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BlueRidgeBoater
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Re: Mixing Brands of Epoxy

Post by BlueRidgeBoater » Tue Jul 30, 2013 5:40 am

I've got a slightly different question. I've been using Glen-L epoxy resin and hardener, but also have West epoxy rresin and hardener. When I run out of Glen-L, can I use the West system resin over the top of the Glen-L resin? Thanks. (Will order more Glen-L, but want to keep going until it comes in).

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jprice
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Re: Mixing Brands of Epoxy

Post by jprice » Tue Jul 30, 2013 6:15 am

BlueRidgeBoater wrote:I've got a slightly different question. I've been using Glen-L epoxy resin and hardener, but also have West epoxy rresin and hardener. When I run out of Glen-L, can I use the West system resin over the top of the Glen-L resin? Thanks. (Will order more Glen-L, but want to keep going until it comes in).
Sure, there shouldn't be any issue with doing that. (I've already done it and it was fine)
As long as you've cleaned off any blush and given a good scuff or sand, then it should adhere fine.

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pauloman
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Re: Mixing Brands of Epoxy

Post by pauloman » Wed Jul 31, 2013 7:40 am

Bill - I stand by what I said - if it hardened up - no worry.

I've been the owner of an epoxy company for 20 years and have epoxies formulated to my specs, as well as probably selling more kinds of epoxy (and from more sources) than anyone.

I made my living from epoxies - I think I know what I'm talking about. --- paul oman epoxyfacts.com

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Bill CNC
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Re: Mixing Brands of Epoxy

Post by Bill CNC » Wed Jul 31, 2013 11:13 am

Paul,

We will have to agree to disagree.

In the 41 years (since 1972) I have been using epoxy professionally and personally, ... I would NEVER EVER recommend mixing one side of the mix from a different MFG than the other, ... EVER, ... PERIOD and it is EXTREMELY DANGEROUS to even suggest it. Nor would I let a partially cured resin stay on the piece of work, nor would I just lay another coat on top of a questionable coat.

It has never worked well and in the end, ... it never will.

I have had many people come to me with layup issues, non hardening and partial hardened epoxy to try to fix. Sure, they seem fine when it's cold, but when they warm up, ... you have rubber. I have made examples for client to see, what the risks are. I show them a layup, that seems just fine indoors, ... take it out to the sun and let it sit for a little then I will fold the glass completely like a napkin, ... NOT ONE CRACK sound can heard, ... why would that be? The glass is pulling through the resin because the resin is soft.

I have seen countless layups where the glass telegraphs through the supposedly cured resin, why is that? The resin really isn't cured properly.

Now what do you think is going to happen with the structural frame work joints? Your only relying on the fasteners and not the epoxy to do the job.

I could go on, ... but I think you see my point.

Regards
Bill
Bill

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Old aussie
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Re: Mixing Brands of Epoxy

Post by Old aussie » Wed Jul 31, 2013 2:53 pm

Mixing different epoxys ,never do that it is sensitive enough with ratios with right hardners. plan your build better buy another kit
before you run out or do something else until you get some.....

Old Aussie Peter....

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