epoxy primer mix

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PostPosted: Sat May 02, 2020 10:04 am
When mixing epoxy primer using grams. Are 83 grams of DP50LV, 114 grams of DP401LV, and 150 grams of DT18xx. for a total of 347 grams, right. The reason I ask is that it seems there is very little grey primer that goes in. The mix is 2:1:1. 2 parts Epoxy primer, 1 part Hardener, and 1 part Reducers. This to make a 1/4 of a pint. Thanks.



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PostPosted: Sat May 02, 2020 11:37 am
ok 4oz is 1/4 of a pint so 2 oz. part A the color 1 oz. of part B then 1 oz of reducer. you can do the change over just ask goggle. 2 oz.= 56.699 grams. just a tip the reducer isn't necessary, but you can use it to tailor the mix to how ever you want it. spray ,brush, dip or what ever. spraying might need reducer, brushing probably wouldn't.
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PostPosted: Sat May 02, 2020 5:47 pm
Wabigoon wrote:Are 83 grams of DP50LV, 114 grams of DP401LV, and 150 grams of DT18xx. for a total of 347 grams, right.


No. These weights are cumulative. So, put your cup and stirrer on the scale and zero. Then put in 83g DP50LV and then add DP401LV until the scale shows 114g, then add DT18xx until the scale reads 150g. Obviously don't zero the scale between products.

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PostPosted: Sat May 02, 2020 7:32 pm
NFT5: Thanks for the reply. This was very confusing for me. I now understand how to mix this right. It may seem easy to pros but for people starting out it's confusing. Again many thanks for the reply.

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PostPosted: Sun May 03, 2020 8:54 am
It's not as confusing if you just use a painters cup.
Less chance of a screw up too.
If you don't trust the cup measurements, check for yourself.
Take two identical cups and use one to check the other.
for example, if you want to check the 4 to 1, fill one cup
to a mark and pour it into the other cup 4 times, should equal the mark for 4:1.
So much easier.
JC.

(It's not custom painting-it's custom sanding)

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PostPosted: Sun May 03, 2020 9:00 am
Wabigoon wrote:The mix is 2:1:1. 2 parts Epoxy primer, 1 part Hardener, and 1 part Reducers. Thanks.


What epoxy uses a 2:1 mix?
All the ones I know of is 1:1.
JC.

(It's not custom painting-it's custom sanding)

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PostPosted: Sun May 03, 2020 12:27 pm
840r.jpg
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PostPosted: Sun May 03, 2020 3:20 pm
That is a 4 to 1 mix.
So 4 parts epoxy to 1 part activator
First epoxy I've seen like that.
JC.

(It's not custom painting-it's custom sanding)



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PostPosted: Sun May 03, 2020 3:35 pm
I've use Corlar epoxy primer (Dupont) and I think it mixes 3 to 1 then reducer. i'm like JC most epoxys I've been around were 1-1 then reducer. come to think about it I think DP90 IS 2-1 ? I guess it pays to pay attention :cry:
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PostPosted: Sun May 03, 2020 6:50 pm
badsix wrote:I guess it pays to pay attention


100% true.

I have another Epoxy that is 3:1:1 and I've used others that are 2:1, 3.5:1 and even 1:1.

Moral of the story is what we keep on saying here: "Read and follow the TDS".

As an aside, although I do have mixing cups, I rarely use them. Two reasons:
1. They're expensive, especially when you're using maybe 10/day; and,
2. They're not as accurate as scales. I have 2 sets of scales which have accuracies to 0.05g and 0.01g. It is usually possible to get the actual weights of each product and use these, rather than try to estimate whether a level is on the line, below the line or above the line on a mixing cup. Maybe it doesn't matter that much for primers and clears but it certainly does when mixing colours and keeping it as exact as possible satisfies my sense of pedantry.
Chris
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