SP 106 vs Ampreg 21 by Gurit

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SP 106 vs Ampreg 21 by Gurit

Post by TomTom » Thu May 30, 2019 6:42 pm

Which of these two resins is more suited to this type of epoxy-wood composite boat building?

And what differences might one notice between different epoxies?



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Re: SP 106 vs Ampreg 21 by Gurit

Post by fallguy1000 » Thu May 30, 2019 11:11 pm

Based on a quick read and no real experience; Gurit recommends Ampreg for heavier fabrics. This likely means it is less viscous. That mght make it a bit runny for a wood hull side laminate, for example.

Gurit also says the SP106 is formulated for wood lamination.

You can always call Gurit tech support. I have found them to be very helpful.
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Re: SP 106 vs Ampreg 21 by Gurit

Post by Evan_Gatehouse » Thu May 30, 2019 11:23 pm

I've used Ampreg 21 and 22. Both are very nice for wetting out fabrics. And at least one of them was dyed (yellow/blue) so when properly mixed it would turn green. I like them
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Re: SP 106 vs Ampreg 21 by Gurit

Post by fallguy1000 » Fri May 31, 2019 3:13 am

That color change principle is so basic. I sure wish Systems 3 did it. Would have saved me one big mess when I forgot to stir.
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Re: SP 106 vs Ampreg 21 by Gurit

Post by piperdown » Fri May 31, 2019 8:00 am

fallguy1000 wrote:
Fri May 31, 2019 3:13 am
That color change principle is so basic. I sure wish Systems 3 did it. Would have saved me one big mess when I forgot to stir.
Couldn't you just add a drop or so of epoxy tint to the resin and hardener to get the same effect? Blue in one, yellow in another.
https://www.systemthree.com/products/ep ... 3268641988
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"Give an Irishman lager for a month and he's a dead man. An Irishman's stomach is lined with copper, and the beer corrodes it. But whiskey polishes the copper and is the saving of him." --> Mark Twain

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Re: SP 106 vs Ampreg 21 by Gurit

Post by TomTom » Fri May 31, 2019 8:05 am

Ok - so Ampreg 30 will replace Ampreg 21 ... better environmentally and health wise and more UV stable.

Ampro will bow replace SP106 - that’s what I have been told https://www.gurit.com/-/media/Gurit/Dat ... erview.pdf.

The tech guy at Gurit was very helpful on the phone and he said the SP106 has a little more elasticity and is slightly more viscous than the Ampreg; and is more of a general purpose epoxy where as the other is a laminating system which is specifically designed for wetting out heavier fabrics and vacuum bagging etc.

Both will work fine he says - but pointed me towards the SP106 for this sort of work.

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Re: SP 106 vs Ampreg 21 by Gurit

Post by OrangeQuest » Fri May 31, 2019 9:46 am

piperdown wrote:
Fri May 31, 2019 8:00 am
fallguy1000 wrote:
Fri May 31, 2019 3:13 am
That color change principle is so basic. I sure wish Systems 3 did it. Would have saved me one big mess when I forgot to stir.
Couldn't you just add a drop or so of epoxy tint to the resin and hardener to get the same effect? Blue in one, yellow in another.
https://www.systemthree.com/products/ep ... 3268641988
Most of those types of epoxy tints use epoxy resin to suspend the tint. You have to substract the amount of clear resin from the amount of tinted resin you add. Example: I add 20 grams of tinted resin to my mixing cup, I then add 80 grams of resin for a total of 100 grams. Mix that well and then add the 43 grams of hardener to make the epoxy. (2 to 1 ratio epoxy) If you use a powder tint then you can do as you say. From what I have read that is what is used in the tinted epoxies anyway.
"that it isn't just an ordinary sort of boat. Sometimes it's a Boat, and sometimes it's more of an Accident. It all depends." "Depends on what?" "On whether I'm on the top of it or underneath it."
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Re: SP 106 vs Ampreg 21 by Gurit

Post by piperdown » Fri May 31, 2019 10:53 am

OrangeQuest wrote:
Fri May 31, 2019 9:46 am
piperdown wrote:
Fri May 31, 2019 8:00 am
fallguy1000 wrote:
Fri May 31, 2019 3:13 am
That color change principle is so basic. I sure wish Systems 3 did it. Would have saved me one big mess when I forgot to stir.
Couldn't you just add a drop or so of epoxy tint to the resin and hardener to get the same effect? Blue in one, yellow in another.
https://www.systemthree.com/products/ep ... 3268641988
Most of those types of epoxy tints use epoxy resin to suspend the tint. You have to substract the amount of clear resin from the amount of tinted resin you add. Example: I add 20 grams of tinted resin to my mixing cup, I then add 80 grams of resin for a total of 100 grams. Mix that well and then add the 43 grams of hardener to make the epoxy. (2 to 1 ratio epoxy) If you use a powder tint then you can do as you say. From what I have read that is what is used in the tinted epoxies anyway.
I was reading directly from the system three website I posted. The amount used indicates you still go by the standard mixing volume of 2-1, regardless of the color additive. Or at least that's what I got from their website.
Eric (aka, piperdown)

"Give an Irishman lager for a month and he's a dead man. An Irishman's stomach is lined with copper, and the beer corrodes it. But whiskey polishes the copper and is the saving of him." --> Mark Twain

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Re: SP 106 vs Ampreg 21 by Gurit

Post by fallguy1000 » Fri May 31, 2019 2:03 pm

It all sounds simple until the epoxy vendor tells you that pigment is resin.

Try adding that to hardener.

Post edit: i seem to recall the pigments are inert...they just tell you to add to the resin...
Last edited by fallguy1000 on Fri May 31, 2019 10:54 pm, edited 1 time in total.
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Re: SP 106 vs Ampreg 21 by Gurit

Post by OrangeQuest » Fri May 31, 2019 2:10 pm

Fallguy, do you know if you can add the dry pigment to the hardener?

Check the MSDS for both the tint and the resin.
"that it isn't just an ordinary sort of boat. Sometimes it's a Boat, and sometimes it's more of an Accident. It all depends." "Depends on what?" "On whether I'm on the top of it or underneath it."
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