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Old 08-10-2009, 03:43 PM
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Epoxy Primer & 2K Urethane Primer

Hi all

I would like to know

what is the different between Exopy or 2K Urethane?

I usually use regular primer then sealer

thanks

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Old 08-10-2009, 04:36 PM
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You got a touch of dyslexics donít you? Its spelled epoxy.

Epoxy is a direct to metal primer. 2K urethanes are not. If you apply a 2K urethane directly on treated metal, it will peel off within 24hrs. Trust me I had a nightmare with a job I took over after someone else had already started. It was a waste of material and my time.
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Old 08-10-2009, 04:39 PM
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Quote:
Originally Posted by cjperotti
You got a touch of dyslexics donít you? Its spelled epoxy.

Epoxy is a direct to metal primer. 2K urethanes are not. If you apply a 2K urethane directly on treated metal, it will peel off within 24hrs. Trust me I had a nightmare with a job I took over after someone else had already started. It was a waste of material and my time.
Can I apply 2k Urethane over epoxy? or only epoxy prime then sealer/surfacer?

thanks
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Old 08-10-2009, 04:42 PM
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Quote:
Originally Posted by acquadigio79
Can I apply 2k Urethane over epoxy? or only epoxy prime then sealer/surfacer?

thanks
I'm not a paint expert..But I have with good results.. The 2k is a high build primer..
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Old 08-10-2009, 05:06 PM
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Using SPI products we consistently use two wet coats of epoxy for the sealing and rust prevention qualities and then use either the regular 2k or 2k high build for the blocking step..makes a very good job that way..all the primers that are needed IMHO..to seal or not to seal depends on what one is doing..

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Old 08-10-2009, 05:08 PM
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This is where going on line and researching the tech sheets on products pays dividends. Yes, you can.

However, epoxy is a high build primer itself. Therefore, you donít really need a 2K primer. Additionally, if you read any of the epoxy primer tech sheets it will instruct you that if you reduce the epoxy, as instructed, it can be used as a sealer eliminating the need to purchase additional products.
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Old 08-10-2009, 05:15 PM
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Quote:
Originally Posted by cjperotti
This is where going on line and researching the tech sheets on products pays dividends. Yes, you can.

However, epoxy is a high build primer itself. Therefore, you donít really need a 2K primer. Additionally, if you read any of the epoxy primer tech sheets it will instruct you that if you reduce the epoxy, as instructed, it can be used as a sealer eliminating the need to purchase additional products.
Really depends what brand you are using. Sikkens Epoxy can be used as epoxy or sealer with 1 coat. It can also be used as a medium build primer with 2-3 coats. All 3 uses use the same mixing ratio.

I always wait about 15-20 minutes after epoxy and apply 2k primer or polyester. Works excellent.
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Old 08-10-2009, 05:30 PM
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Quote:
Originally Posted by jeremyb
I always wait about 15-20 minutes after epoxy and apply 2k primer or polyester. Works excellent.

That is how I like to use it...Sanding Epoxy isn't fun..
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Old 08-10-2009, 05:44 PM
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You're right it isn't a lot of fun. However, I like the why it feather edges. Worth the extra effort in my opinion to get a quality finish. Additionally, I do apply regular primer over it and watersand to finish. This step is usually done twice to get the finish I desire to paint over.
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Old 08-10-2009, 06:38 PM
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Good timing for your question, Acqua; go to my Photo Album to see what my son and I did this past weekend. We shot the truck in epoxy primer, then about 30 minutes later, shot it with 2 coats of 2k primer in high-build mix. Looks like it came out great. Now comes the fine sanding followed by another coat or two of the 2k primer. Boy it's good to see the cab in one color again!
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Old 08-11-2009, 04:23 PM
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Quote:
Originally Posted by jeremyb
Really depends what brand you are using. Sikkens Epoxy can be used as epoxy or sealer with 1 coat. It can also be used as a medium build primer with 2-3 coats. All 3 uses use the same mixing ratio.

I always wait about 15-20 minutes after epoxy and apply 2k primer or polyester. Works excellent.

man i thought i was the only person using this stuff lol

just done an inlet mani and cam cover today

same as you say 2 coats of 2k epoxy then 2 coats of high build hope it grips onto that alloy lol


tommy
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Old 08-11-2009, 04:50 PM
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i use spi epoxy for surfacing .
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Old 08-12-2009, 12:06 PM
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Quote:
Originally Posted by NEW INTERIORS
That is how I like to use it...Sanding Epoxy isn't fun..
I'm a newbie and will be shooting epoxy primer too pretty soon. I planned to shoot 2K high build later on, but not after 30 minutes. What makes sanding epoxy so tough? What grit would you recommend? If it's really that tough, then I will plan to shoot both on the same day.
Thanks!
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Old 08-12-2009, 06:22 PM
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Quote:
Originally Posted by acquadigio79
Can I apply 2k Urethane over epoxy? or only epoxy prime then sealer/surfacer?

thanks
The order of application:
#1 strip to metal.
#2 epoxy primer
#3 do your body work
#4 2K primer
#5 Block
#6 more 2k primer
#7 block
#8 spot prime as needed (2K reduced slightly)
#9 finish sand with a block
#10 seal with epoxy
#11 scuff and paint.
(If you elect to use an "etching primer" on the bare metal, then apply epoxy over that, and proceed with step #3)

Yes you can apply 2K over epoxy, and vise versa. But you want to apply epoxy to bare metal.

Thanx
Shorty
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Old 08-12-2009, 06:35 PM
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Quote:
Originally Posted by danny_g
I'm a newbie and will be shooting epoxy primer too pretty soon. I planned to shoot 2K high build later on, but not after 30 minutes. What makes sanding epoxy so tough? What grit would you recommend? If it's really that tough, then I will plan to shoot both on the same day.
Thanks!
Sanding epoxy is not really all that bad, if it's had plenty of cure time.
Sanding it the next day, you'll find that it's kinda "gummy". But it can be water sanded decently.
What I usually do is to apply epoxy to the stripped part, then I can work it at my liesure. If I need to apply filler I'll skuff it with 80 grit, if it just needs a coat of surfacer, I'll skuff with 180, or 320, or mabe even a red Scotch-Brite.
Now before paint, as a sealer, I'll reduce the epoxy by about 100%, and let it dry overnight. Next day I'll wet-skuff with 600-1000, (to remove any specks) and paint.
Don't confuse epoxy with Por-15, which, when cured cannot be sanded, It's hard as Porceline. (but that's another story)

Thanx
Shorty
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