SPI Epoxy Primer and Lacquer Thinner

O

Outlaw

Ok I get it. Dont use lacquer thinner to wipe off bare metal and then shoot SPI Epoxy Primer.

So here is my question:


Spraying SPI Epoxy Primer on Bare metal that has been cleaned with SPI Solvent and then Waterborne.

Just before completing project, run out of primer.

Mix small amount of epoxy primer and let induce 30".

Gun run dry, but put a little lacquer thinner in it and shot it thru the gun, then placed gun on stand.

While Epoxy inducing, go back and give gun a little trigger pull to run lacquer thinner thur it while waiting for epxoy to induce.

Now five minutes from being able to spray induced Epoxy.

Spray rest of lacquer thinner thru gun and wipe down.

Add SPI Urethane Reducer to gun and pull trigger to push lacquer thinner out.

Add more reducer to gun to rince cup and pull trigger to get rid of urethane reducer in gun.

Add induced epoxy and finish spraying.

Is this ultimately mixing lacquer thinner and SPI Epoxy, and, would it be better to just completely clean the gun while Im waiting for the epoxy to induce?
 
No. Your procedure is just fine, you won't be inducing any lacquer into the epoxy. What you don't want to do is add any to your mix, that is what they are really going to frown on. What you are doing is perfectly fine.
 
After "cleaning" with the thinner, spray a little reducer through the gun to clean out the reducer.
 
Perfect, what I was hoping to hear. Always follow thinner thru gun with reducer.
 
I'm gonna go out on a limb and say that even IF there were a few drops of lacquer thinner left in the gun, you are not in any trouble at all. Some of these products are sensitive about certain things, but not THAT sensitive.
 
Thanks Crash. I dont like getting myself in that position by underestimating how much epoxy I need to mix, but I did this time. I usually have a place to use up any extra in case I over mix.
 
In the old days, PPG recommended DT reducer or Laquer thinner to reduce their DP Epoxy for use as sealer. This would indicate to me a few drops of thinner would not have a negative effect.

John
 
My understanding is SPI is more subject to failure when it comes in contact with lacquer thinner than PPG.
 
Outlaw;n75433 said:
My understanding is SPI is more subject to failure when it comes in contact with lacquer thinner than PPG.
Click to expand...

Not the case at all, we state don't clean the metal with lacquer thinner but if you must for what ever the reason may be go over it twice with wax and grease remover.
Could you mix lacquer thinner with the epoxy? Yes BUT the lacquer thinners you buy today for $45 a 5 gallon pail is not lacquer thinner but gun cleaner.
So if you have some real lacquer thinner like DTL 876 or DTL 105 or PNT 90, it will work fine.
 
I was under the impression that the cheaper lacquer thinners are oily, which is why you do not wipe a panel before you spray it because you will see the marks of the rag you use. Mineral spirits is the cheapest clean up material with the most oil. I thought they were both good for clean up since they left a light film on wet parts to lubricate.

Sounds like maybe the real answer is spray a little wax and grease remover thru a gun right before adding the epoxy?
 
Use a spray bottle. You have to wipe it off and let it dry before moving to next steps.
 
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