Help with Fish Eyes or something else

C

Craig L

I've been plodding along on my first ever car project since last summer. I am using SPI W&G remover, SPI epoxy, 2k and also purchased some SPI reducer in anticipation of using the epoxy as a seal coat in the not too distant future.

I have always had a fish eye here or there but the last two times I have shot SPI Expoy, things are out of control.

Prior to today, I had been using these nice 12"x12" blue surgical towels that my surgeon brother gave to me with the W&G remover. I had about 50 of them and during their first use they were "sterile".

I have also used various brands of tack clothes and today used one from NAPA.

Today, I thought that maybe the "sterile" towels were tainted since they had now been through the washing machine so I used those disposal blue shop towels.

Before mixing the Epoxy, I cleaned the mixing container with reducer as well as the paint reservoir on the gun.

I also, have installed a new air cleaner at the outlet of the compressor which, by the way, is a kobalt 60 gallon 11.5scfm @ 90 and 13.4scfm @ 40.

I am using the purple harbor freight guns and have even tried three different brand new ones after taking apart and cleaning with reducer.

I went up to 60 psi with trigger pulled and down to 20 psi and no difference in my problem. I went from 1 1/2 turns on to 3 turns out and still the same thing.

I am down to my last piece to shoot with epoxy and then 2k (which is already done on 80% of the car) and am going freaking crazy.

Also, I started using a knife, cleaned with reducer, to mix the epoxy because I had been using wood paint sticks and thought maybe that was the problem.

I apply the W&G remover through a spray bottle.

Finally, I have had the UFO air cleaners just prior to the gun both on and off and no difference.

I will say that this problem seemed to start when I purchased a second gallon of W&G remover but I was still using the already washed "sterile" blue rags back then. Also, i am on my second gallon of epoxy. Please don't take this as a slam against the products but could either of these come contaminated from the factory?

One of the pictures on on a piece of the car and the other is on a piece of heavy brown paper.

HELP!!!

Thanx - Craig camaro may 11 001.jpg

camaro may 11 002.jpg
 
also, i always make sure metal is above 60 (it is about 75 here today) and I waited about 45 min after cleaning with W&G remover and have sometimes cleaned it the night before when it's cooler and then tacked it off just prior to shooting the next day.
 
When is it showing up, as soon as you spray the first coat or the second coat?
Is the problem even across the whole panel or is it a big spot here , then OK and then another spot?
 
Barryk;8034 said:
When is it showing up, as soon as you spray the first coat or the second coat?
Is the problem even across the whole panel or is it a big spot here , then OK and then another spot?

Today is showed up on the first coat. The picture I posted actually has two coats on it as far as the car part. The brown paper picture is just one coat.

The problem today was across the entire area sprayed. I had a door to shoot but did not shoot it.

Also, the shop was about 68 degrees and the floor, where the primer and reducer sit, were at 63 degrees. I had let the mix sit for about 30-40 minutes before shooting.
 
From what you say and looking at the picture, it has just got to be coming from water in air hose (vapors)

This will usually get worse as it warms up and will be at its worse if the compressor has been run all day and then you paint something.

All you can try to see if this is the problem is after compressor sat over night, drain tank and stick a fitting in the end of hose and let blow for five seconds.

This is all I can think of, maybe some one else can come up with a better reason.
 
try spraying with the gun empty, or maybe an air tip and see if anything comes out?
 
Craig L;8026 said:
I also, have installed a new air cleaner at the outlet of the compressor which, by the way, is a kobalt 60 gallon 11.5scfm @ 90 and 13.4scfm @ 40.

Finally, I have had the UFO air cleaners just prior to the gun both on and off and no difference.

Thanx - Craig
Craig,

What kind of 'new air cleaner' is it? If it's one of those bronze filters in a bowl to collect water, you may still have oil in the air supply. Several people suggested using a Motor Guard coalescing filter to be certain all the oil is removed.

Filter in a Bowl:
PA2121_175.jpg

http://www.aircompressorsdirect.com/Campbell-Hausfeld-PA2121/p418.html

Motor Guard:
M-60.jpg

http://www.motorguard.com/air_2.html
 
Barry suggested that motorguard to me and my jobs have turned out nice. I use to get craters here and there but that seems to hve stopped. Look at tooltopia. I got a housing and two filters for $75.
 
That's some narly contamination, I would bet it's in the air supply.
 
Thanx for the replies everyone. I spent an hour Saturday night cleaning the gun with reducer. Sunday morning, I grabbed my practice fender that I had taken to bare metal and shot with Epoxy several months ago. I washed it with soap and water and dried and then scuffed. I penciled off three sections with the first being one left as is (no cleaning with W&G remover), the second section was cleaned with W&G with the surgical towels and the third section was cleaned with W&G with the blue towels. Just prior to shooting, I tacked half of each section so now I had six distinct panels. My first pass across all six sections was without a UFO water collector at the gun with the remaining passes with one attached. All 12 panels looked just like my pictures except the uncleaned panels had trash in it! I eliminated the tack cloth, W&G remover, and both types of towels as being the problem. It was either something in the gun, the air source or the epoxy.
I then grabbed my suction primer 2.0 gun and put the rest of the already mixed epoxy in it. Presto, everything looked great.
So, harbor freight guns go in the trash and it's time to buy a quality gun like I should have in the first place.
Also, I do have one of the bronze filters in a bowl types and will definitely look into a Motorguard.
Thanx for all your tips.
 
Craig,

Was this the first use on a brand new gun? I would think no matter what oils where in that gun, thinner would wash it out. BTW, I just ordered one of those Motor Guard filters. The last thing I need is problems like you and Arrowhead have had.
 
I have used 2-3 times but the problem has never been this bad which is weird?
 
hf guns have pressure gauges? those gauges have lots of assembly grease. dont even use them now!
 
Bob Hollinshead;8062 said:
That's some narly contamination, I would bet it's in the air supply.
X2 on the air supply. Getting fisheyes on masking paper is a sure sign of air or hose contamination.
 
Sounds like he found the problem, a contaminated gun.
I wonder if the air passages were washed or just the fluid side of the gun?
I have never washed the air side of a gun from inlet to air cap.
Have a new Vaper for a primer gun, think I will wash both the fluid and air sides before using it.
 
I just broke out a new HF gun last night to epoxy some rub throughs and filler. After reading this thread, especially what Form said about the regulator being greased up, I checked out the gun pretty carefully. IT WAS A MESS! The regulator was covered in oil inside and out, and so was the gun.

I sprayed solvent based W & G remover through the air side of the gun and regulator and blew it out several times. Then I ran reducer through the fluid side, and blew it out some more. After letting it sit a while, I sprayed my epoxy without a single fish eye.
 
Senile Old Fart;8099 said:
Sounds like he found the problem, a contaminated gun.
I wonder if the air passages were washed or just the fluid side of the gun?
I have never washed the air side of a gun from inlet to air cap.
Have a new Vaper for a primer gun, think I will wash both the fluid and air sides before using it.

Dumb me, I didn't think about cleaning the "air" side of the gun.
 
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