SPI 2k Primer, or High Build primer? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 03-03-2011, 11:09 AM
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SPI 2k Primer, or High Build primer?

I was just on the phone with SPI, and they recommend just using the regular 2K epoxy instead of the high build, and just applying extra coats. They said there is no real advantage to the high build.

Anyone heard of this with SPI? What products do you guys use?

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Old 03-03-2011, 12:01 PM
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spi

If thats what they told you about their products listen. Barry is a stand up guy (very knowlegeable). He stands behind his products well. And their stuff will give excellent results. I haven't used the 2k primer yet, but the epoxy and clears are top self. Barry will help with issues if you have any... Give em a shot you'll be glad you did.
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Old 03-03-2011, 12:27 PM
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If you need anything heavier then the SPI primer, possibly a polyester primer would be the correct material - it's basically a sprayable body filler (you will need a 1.8 to a 2.2 gun tip). I used the standard SPI primer everwhere on my car but the trunk lid which needed more help then just filler and Barry's 2K.

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Old 03-03-2011, 02:08 PM
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Well trying to do all the filler first so I won't need to spray poly primer..

But it's not odd at all that they recommend their normal instead of their hi build? I thought hi build was the industry standard!
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Old 03-03-2011, 04:10 PM
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you must mean 2k urethane primer. Epoxy is epoxy...there is no hi-build or regular epoxy. Even though compared to others, their epoxy is a hi-build.

All i use is hi-build primer. 3 coats, block, 3 more coats, block/wetsand, seal, paint.
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Old 03-03-2011, 05:40 PM
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Yes, I am also buying epoxy.

But urethane wise, they told me to go with the regular build 2k, save $40, and not get the high build. And I can't seem to figure out why, except that they said just do more coats.
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Old 03-03-2011, 07:13 PM
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I always use a high build 2-k and just reduce to what I want for fill. I always let it dry over night before sanding min. But I'am not a production shop so I have the time.
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Old 03-03-2011, 08:12 PM
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That's what I would figure, so let me restate my question.

"Has anyone who was about to order High Build from SPI get told to just order the regular 2k"..

And even to go farther with that question, what's even the point of using a 2k urethane if it's not a high build?
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Old 03-04-2011, 04:45 AM
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i think the question is, what are you using the primer for? how much bodywork are you priming? you doing the whole car?
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Old 03-04-2011, 06:45 AM
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I've used all three, epoxy, 2K and 2k high build. The high build is very thick, I usually add a little reducer so it flows out of the gun better. It's still thicker than the regular 2K sprayed this way though. I've had discussions about the regular 2K vs the 2k high build on the SPI forum and basically they are similar except the the HB is a condensed version of the regular 2K. It may cost more per gallon, but you get more coverage / thickness per gallon than the regualr 2K also.

I'm working on a VERY rough '55 Tbird so there have been many priming and blocking sessions even with the HB.

As far as SPI reccomending one over the other, it's really personal preference and what the project requires.
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Old 03-04-2011, 06:59 AM
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Myself if i can't get there with epoxy, reg 2k and Marson Platinum then i need to do a lot more metal work before trying to paint..The high build is used for scratches like we used to use the old body putty..Just for those troublesome spots..they did at one time put up the high build in quarts..


and for clarification.
Epoxy is part#6600,6610,6620,6700 activatorat
2k regular is #6520 gray and 6501-4 activator
2k high build is #7000-1 and 7001-4 activator

Just me though.
Sam
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Old 03-04-2011, 07:35 AM
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With a hi build primer if you aren't careful you can run into shrinkage issues. Unless you are trying to cover up some rough body places take Barry's advice.

Vince
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Old 03-04-2011, 12:25 PM
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Thanks guys. Whole car is pretty rough. At the moment it's in bare metal with filler on it (I'm sure I'll have to do more, but I'll be able to tell better when it's one solid colour).

So if Barry and the other guy who works there are telling me to get the regular build, maybe I should just do that.. How far (How many coats) could you get away with SPI regular build 2K? (1.25 gallons I suppose).
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Old 03-04-2011, 12:42 PM
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i use the SPI reg 2k everyday in my collision shop and it is a very nice filling primer and sands great.

i have never used the SPI HB 2k as if i need anything that fills better than the reg 2k i need to go back to work on Body work


there is nothing non high building about the reg 2k.




everyone needs to remember that primer shrinks and if you use a ton of the stuff to cover up shoddy work it show back up down the road

i also use SPI Turbo prime,this stuff rocks also.


Barry told me the same when i started buying from them.so i never went with HB 2k,no need for it.

Hope this helps,Travis
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Old 03-04-2011, 01:17 PM
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Helps immensely when you said there is nothing non high build about it. I guess I'll try that!
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