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Author Topic: The best thinner for resin  (Read 331 times)

old_gunner

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The best thinner for resin
« on: April 25, 2021, 03:41:04 pm »

What would be the best thinner for 2 part resin?
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Subculture

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Re: The best thinner for resin
« Reply #1 on: April 25, 2021, 03:47:46 pm »

What type of resin. Polyester, Epoxy, polyurethane etc.?

john44

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Re: The best thinner for resin
« Reply #2 on: April 25, 2021, 03:48:29 pm »

De  natured alcohol.


John
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nemesis

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Re: The best thinner for resin
« Reply #3 on: April 25, 2021, 03:53:54 pm »

no more than 10% acetone, nemesis
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old_gunner

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Re: The best thinner for resin
« Reply #4 on: April 25, 2021, 05:32:28 pm »

What type of resin. Polyester, Epoxy, polyurethane etc.?
Opps, sorry should have stated epoxy resin.
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Taranis

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Re: The best thinner for resin
« Reply #5 on: April 25, 2021, 05:50:19 pm »

Personally I use Isopropanol
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ANDY
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old_gunner

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Re: The best thinner for resin
« Reply #6 on: April 25, 2021, 06:17:35 pm »

Personally I use Isopropanol
Andy
Thank you for your reply, may I ask what mixture % do you use.
Bill
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tonyH

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Re: The best thinner for resin
« Reply #7 on: April 25, 2021, 06:32:52 pm »

Bit like bucket chemistry but normally about 5%. I e. don't flood it! :-))
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Taranis

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Re: The best thinner for resin
« Reply #8 on: April 25, 2021, 07:10:25 pm »

Andy
Thank you for your reply, may I ask what mixture % do you use.
Bill


It depends what I'm going to use it for but I generally use finishing resin mixed with up to a 30% for a first coat on softwoods and balsa. Ideally I treat both sides of the wood during construction while still accessible.
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old_gunner

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Re: The best thinner for resin
« Reply #9 on: April 25, 2021, 10:24:02 pm »

Thank you, Tony H and Taranis I shall try it in the morning.
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Taranis

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Re: The best thinner for resin
« Reply #10 on: April 25, 2021, 10:29:16 pm »

Most vital is that both resin parts are exactly equal. I mix the resin then add isopropanol, while mixing it in it will first go cloudy, keep stiring until it is clear again and some more.
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Subculture

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Re: The best thinner for resin
« Reply #11 on: April 26, 2021, 09:40:27 am »

Heat also works in thinning epoxy and doesn't compromise the strength like adding thinning agents.

tonyH

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Re: The best thinner for resin
« Reply #12 on: April 26, 2021, 10:05:15 am »

Just to elaborate of the last post, the thinners will only evaporate while the resin is in a gel state. Once it's solid it's fixed and can compromise the strength to a small extent. So any effect will vary depending on how much you use, the environment temperature and also the speed/slowness of the resin cure.This is from EasyComposites a few minutes ago.
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Taranis

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Re: The best thinner for resin
« Reply #13 on: April 26, 2021, 10:22:43 am »

As I said it depends on what you are using it for.
The situation I described is for maximum absorption as a first coat and finishing resin has a long setting time giving plenty of time for evaporation  :-))


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Big Ada

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Re: The best thinner for resin
« Reply #14 on: April 26, 2021, 04:36:22 pm »

Heat also works in thinning epoxy and doesn't compromise the strength like adding thinning agents.
I repaired a cracked hull by pouring the mixed resin inside then warming with a Heat gun and swishing it around, it does not need a lot of heat.
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SteamboatPhil

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Re: The best thinner for resin
« Reply #15 on: April 26, 2021, 07:43:21 pm »

I sort of do the reverse, heating /warming resin, mixing (while still warm) then applying, long cure time though  :-)
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