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Old 11-04-2005, 07:07 AM
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Spraying SPI Epoxy - Orange Peel

I've been using SPI epoxy for my latest restoration. So far I really like this stuff. It is like an armor coat! Very tough but still fairly easy to sand. THe only problem that I am having is that no matter how I adjust my gun, it still has an orange peel to it. So far it hasn't been a big deal because I always wetsand/sand after epoxy. Not sure if this is normal or not. I've used two different guns (both Harbor Freight HVLP guns, 1 is a pressure pot and the other is a regular HVLP gravity feed with 1.4 tip).

I've used PPG and Dupont epoxies before. They don't seem to be as tough of a coating as SPI but they lay down a lot smoother.

Again, this is no big deal because I am resanding the epoxy, but I am just curious if I am doing something wrong. I mix 1:1 with no reducer. I don't use those cheap gun filters (learned that the hard way), etc


THanks,
kev

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Old 11-04-2005, 07:17 AM
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The epoxy is a little thicker than most.

I would guess as your gun setup is good the epoxy should be sprayed a little wetter.

I spray a coat of epoxy just like I'm spraying a clear coat.
If you lay a wet coat it will have a slight peel and than you will notice it
disappears after about 5 minutes.

Other options.
*Try 5 more pounds of air at the gun.

*Add 2 oz of urethane reducer to a mixed 1/2 quart, mix let set in mixing cup for 10 minutes, stir again and pour in gun.

*Another option is mix in mixing cup, let epoxy set 10 minutes and stir again, than pour in cup. (mating)
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Old 11-04-2005, 07:43 AM
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Kevin there is a learning curve with some products... As stated spi is thicker.... I used the reducer at first when i started spraying it because I could not get it flat enough... Now I spray it through my mini gun when doing small parts and it lays down nice.... but I lay it down wet too.. BTW my mini is 1.0 tip... I have sprayed it allot unreduced through that gun

Follow Barrys instructions and you will be fine bro

Matthew
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Old 11-04-2005, 07:51 AM
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Quote:
Originally Posted by BarryK
*Another option is mix in mixing cup, let epoxy set 10 minutes and stir again, than pour in cup. (mating)
Barry: What does this do? Does this also help with clearcoats?
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Old 11-04-2005, 08:03 AM
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Quote:
Originally Posted by jcclark
Barry: What does this do? Does this also help with clearcoats?
*********************************************

Its called mating.
If you noticed before as your mixing the epoxy with the activator, it just does not like to mix together as say a base with a reducer.
Epoxy is a strange bird.

So if you let the activator set in the cup after you stirred it for 10-30 minutes
it will break itself down and mix a lot better.
Another benefit is epoxy is a dirty product and when using as a sealer coat and induced pot mixture will actually make the epoxy spray slicker and cleaner.

Benefit to doing this with clear or primer?
Yes but on a much smaller scale.

Primer I would not consider doing because of limited pot life.

Clears, I do let set for 3-5 minutes.
Won't hurt and MAY help.
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Old 11-04-2005, 08:26 AM
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Great info Barry, you should make it a tip of the day.
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Old 11-04-2005, 09:27 AM
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Thanks for the guidance!

In fact, I've noticed a difference in letting the cup sit for a couple minutes. I've been working on the door/fenders etc of the car at an adult auto body course at the local vo-tech in my area. Last week I mixed up 20 ounces of primer to spray several components. I mixed it up and poured it into the cup. I walked to the spray booth but there was a guy in there also spraying primer. I hung up the gun for about 5 minutes until he was finished and then went in and sprayed. The primer sprayed really nice that day! Like you said, it went on wet and had some orange peel but this dissappeared after a few minutes. I was impressed with the finish, it was the best one I had yet.

However, last night I sprayed two other components. I mixed the epoxy exactly like before, put it in the gun and went right in to spray. The finish didn't come out anywhere near as good. My gun was very clean and nothing else was different than the prior time except for letting that gun sit for those 5 minutes! I guess this confirms what you said!


Thanks,
kev
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Old 11-04-2005, 10:05 AM
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Could part of the benefit of letting it sit come from the heat generated by the process? That would likely cause it to get less viscous. Epoxy generates less heat when it's spread out in a low, flat container after mixing.
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Old 11-04-2005, 10:24 AM
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Kev,
Mix the product a little longer with the paint stick, also.
and mix again after it sets.

Grouch,
No, more a resistance chemical breakdown.
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Old 11-04-2005, 11:16 AM
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I alway's was curious why you had the 1/2 hr. "incubation" period before shooting Nason's Ful-Poxy. Same deal I'm guessing. Even then it didn't look "mixed" well IMO but alway's sprayed good.
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Old 11-04-2005, 05:23 PM
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epoxy in the old days always were 30 minute induction time, then with some refining the epoxy went to no induction.
Although the change has been great there still is a benefit to induction and some companies still require it.
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Old 11-04-2005, 07:32 PM
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Quote:
Originally Posted by BarryK
*********************************************

Its called mating.
If you noticed before as your mixing the epoxy with the activator, it just does not like to mix together as say a base with a reducer.
Epoxy is a strange bird.

So if you let the activator set in the cup after you stirred it for 10-30 minutes
it will break itself down and mix a lot better.
Another benefit is epoxy is a dirty product and when using as a sealer coat and induced pot mixture will actually make the epoxy spray slicker and cleaner.

Benefit to doing this with clear or primer?
Yes but on a much smaller scale.

Primer I would not consider doing because of limited pot life.

Clears, I do let set for 3-5 minutes.
Won't hurt and MAY help.

thats pretty interesting stuff. never knew that but i have always noticed that it doesn't like to mix well and it takes a little extra to get it right. i'll have to start letting it set a little before spraying.

barry's just a fountain of knowledge!!
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