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Old 07-29-2012, 06:06 PM   #1 (permalink)
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Default SPI epoxy for topcoat

Have any of you used SPI black epoxy for topcoat? I read the finish is close to factory. Also talked to a tech rep who said the black has UV protection added. Looking to spray the underside, engine bay, rearend, and most other black pieces. I imagine you can't beat the durability of epoxy primer.
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Old 07-29-2012, 08:42 PM   #2 (permalink)
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I have heard it does, and many people here use it.. Would I do all that work without topcoating it? Nope, not a chance..

You can beat the durability of epoxy primer if you topcoat it with something, at least that would be my opinion. I went with a SS urethane.
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Old 07-29-2012, 09:02 PM   #3 (permalink)
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You bet you can. Epoxy is good enough to use on a garage floor and yet some people think it's delicate and should be protected?

Everything black & red are SPI epoxy.




I did put 3M rubberized over the outer aprons to stop rocks from making noise.




I drove it all summer last season and got caught in the rain a bunch and it held up well.
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Old 07-29-2012, 09:18 PM   #4 (permalink)
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You bet you can. Epoxy is good enough to use on a garage floor and yet some people think it's delicate and should be protected?

I drove it all summer last season and got caught in the rain a bunch and it held up well.
A whole summer?? And rain?? My god, it's a miracle.

I figure, go the extra step, and spray a topcoat. What's another hour of spraying for peace of mind.
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Old 07-29-2012, 09:25 PM   #5 (permalink)
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Because a top coat is not as durable, and often it's used to hide crappy work. Why not just use "goo" that's what many people do.
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Old 07-29-2012, 09:49 PM   #6 (permalink)
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and often it's used to hide crappy work.
Wha? Who cares? I see no bearing on what we're talking about.

You know what kind of work you did underneath it.. Or are you only building your car to sell it?
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Old 07-29-2012, 10:39 PM   #7 (permalink)
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Wha? Who cares? I see no bearing on what we're talking about.

You know what kind of work you did underneath it.. Or are you only building your car to sell it?
I don't get the who cares remark? If I fix it I prefer it to look like new, what ever happened to pride of work or ownership? The factory did not use a top coat, heck they left bare metal in a lot of places so a few good heavy coats of epoxy looks good and protects well. A top coat will not add any more durability or corrosion resistance to the underlying metal structure unless its a bed liner or "goo", and that hides all of the spot welds and detail. Now, many times a guy really doesent want a casual observer seeing what kind of work went into a car at the cruise in so they goo coat it. I always discount new goo as camouflage.






You know you can line a swimming pool with epoxy.


Who cares...lol, I guess I do.
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Old 07-29-2012, 11:16 PM   #8 (permalink)
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No, what I mean is, it's YOUR car, so you'd know you're not hiding anything..

Pride in ownership is topcoating the epoxy.. Not just spraying primer and calling it a day! I guess you get some credit for not just spray bombing it.

Well, I guess all we can do is compare undercarriages one day for the championship.
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Old 07-30-2012, 01:07 AM   #9 (permalink)
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SPI epoxy has UV inhibitors in in it. You can use it under the car by itself, with a clear or topped with a bedliner. Epoxy and bedliner will give the best protection from rust and rock damage.
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Old 07-30-2012, 07:05 AM   #10 (permalink)
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Fstbk that car looks fantastic
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Old 07-30-2012, 09:42 AM   #11 (permalink)
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I have been spraying the engine compartment and under carriage for years with SPI epoxy without a top coat. No need to top coat unless you want it undercoated than I use SPI bedliner.
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Old 07-30-2012, 12:12 PM   #12 (permalink)
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I will say that it will not hold up used on an exterior surface on top of the car. Well, it will hold up, but turn to a flat dark gray.
Last October my Son managed to find a pine tree that jumped out in front of him as he was taking a short cut home one night through the neighbors yard.
Fortunately, I had just removed my stock Laser Red hood for my paint job. It still had good paint on it, so we sanded it down with 220 and then 320 wet or dry and I sprayed 3 coats of SPI black epoxy on it and the front bumper cover.
Here we are 10 months later, and it is now a flat, dull dark gray. If it has UV additives in it, it must not be enough for direct UV all day, 24-7.
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Old 07-30-2012, 12:59 PM   #13 (permalink)
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Exactly.. I like SPI epoxy as much as the next guy, but topcoat the dang thing.. What's the time for 1-2 more coats? If you're doing all that work anyways....
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Old 07-30-2012, 02:32 PM   #14 (permalink)
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Quote:
Originally Posted by ScottsGT View Post
I will say that it will not hold up used on an exterior surface on top of the car. Well, it will hold up, but turn to a flat dark gray.
Last October my Son managed to find a pine tree that jumped out in front of him as he was taking a short cut home one night through the neighbors yard.
Fortunately, I had just removed my stock Laser Red hood for my paint job. It still had good paint on it, so we sanded it down with 220 and then 320 wet or dry and I sprayed 3 coats of SPI black epoxy on it and the front bumper cover.
Here we are 10 months later, and it is now a flat, dull dark gray. If it has UV additives in it, it must not be enough for direct UV all day, 24-7.
You may have a batch before the change in Sept. 2011.
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Old 07-30-2012, 06:17 PM   #15 (permalink)
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Quote:
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You may have a batch before the change in Sept. 2011.
It is. I bought it last summer to spray my axle housing.
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