Didn't induce enough epoxy (long)..

J

jtfx6552

Member
My car was dipped so I need to prime the whole thing.

It was dipped a while ago as the metal work dragged on for years. I should have epoxied it right away, then did the metal work, live and learn.

Anyway, I decided to sand blast the areas under the car and in the car as it is hard to get all the surface rust out of the nooks and crannies. Using a home blaster, and low air pressure so as not to damage anything, this took forever.

Today was the day to actually lay the primer on. Since the car will be white with a red interior. I wanted the red to cover easy, and I won't be block sanding the inside so I decided to use white epoxy inside the car and in the trunk, and black on the bottom and engine compartment.

I mixed up my two "Dekups" with 30 oz in one and 21 in the other in white, since I was going to shoot that first, and mixed 32 ounces of black in a mixing container and let it sit while I did final clean up, which took all day.

It was late, so I figured I'd shoot the white tonight, the black tomorrow.

I started on the white and all was going well until my first 30 oz ran out well before I had one coat done.

Not sure what I should have done, but I got the 21 oz and kept going. In retrospect, maybe I should have stopped waited for it to flash, and used the 21 for the second coat of the area I had done already, but I didn't.

I grabbed the 21 oz and even with that I didn't finish the first coat.

I then mixed up 50 oz of white to use tomorrow. Since I was now sure I didn't mix up enough black for the bottom and engine compartment, I also mixed up the rest of the black I had.

Now, is it OK to finish the little bit i have left to do of the first coat, and put on the second coat of white tomorrow, or should I wait longer, or some other paln?

I did have a few spots that "fish eyed" on me. Obviously based on how fast I ran out, I was laying it on heavy, and in a few spots where my arm ran into things, or I got distracted thinking about how to get out of the way of the gun, I left it linger just a little too long. it was a little cramped on there.

Should I try to dust over the fish eye spots, just paint over them normal, or try to sand before I put on the second coat?

Since they are always fun, here are some pictures:
"overview":
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Inside:
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What I didn't quite have enough paint for:
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It's amazing how much a body shell will use up, isn't it? Just get the remaining thin spots covered, wait a while, then put another coat on the whole thing. Save the sanding for when you have some material build on the vehicle. Now that you know how much it takes to do one coat, make that much again plus 10% for your second coat, and you'll be less likely to run out.
 
On a full rotissery job like that I will oftentimes use up to 5-6 gallons of sprayable start to finish. Think about all that surface area on all the sheetmetal and suspension/drivetrain components. You've got a 7 day recoat window so just spray more the next day if you like inducing the epoxy overnight. If you'll be working on this daily keep the left overs in a sealed container and as long as it mixes well when stirred and viscosity hasn't thickened to the point it can't be sprayed you can keep using it. Add 50% of freshly mixed epoxy and the potlife will be extended. In reality if you plan your usage right there will be no waste.
 
Thanks guys. I figured out that last night I only mixed up the same amount of white I used the first time...

I need to mix some more today. If I wait until tomorrow to shoot it, That means the black that I did mix enough of, will be sitting since yesterday morning.

How can I make sure my pot life is more to the 48 hours, not the 24?
 
I have the heat on in the garage for the paint to cure on the car, about 78 in there, maybe I should take the inducing epoxy to the basement.

My nixing containers have lids, but aren't air tight. Do they need to be?
 
It's better if they are, but for the short time you are talking about I don't believe it should be a problem as long as most air movement is stopped. My preference is a metal can w/lid if saving material for later use. Try to use the material within 48 hours if possible, it's safest.
 
Dried Primer "Fuzz"

Ok, my initial plan before I ran out of induced paint was to put two white coats on the inside of the shell, 30 minutes apart, then spray to coats on the bottom side of the shell 30 minutes apart, right after the white coats.

Yesterday it rained, so I plan to continue today with the rest of the first coat inside the shell, then the second coat.

Yesterday i noticed the bottom has dried primer dust all over it. Now before I start to day, I'll wipe that off. However, does this mean my plan was flawed, and I should just paint the inside of the shell, wait for it to dry enough that I can wipe down the bottom again and then spray that? Or will the "primer dust" be uncured enough that the paint I'm putting on the bottom will "melt" into it?

If I go that route, will the black primer dust from the bottom get stuck on the uncured paint on the inside of the shell?
 
There will probably be a bit of that no matter what you do, it's because it's such a large surface area that takes longer to get around than the flash time of the material.. Decide which part you want to look the best, and do it last. I'd do the bottom last. If any dry spray like that is unacceptable to you, you'll have to mask parts and spray in stages.
 
Thanks! That is the conclusion I was coming to. I decided to finish the white today, then do the bottom(black) tomorrow, hopefully the black will still be sprayable, 32 OZ was mixed Friday morning and another gallon Friday night.. The white will *I think* be cured enough that the dust from shooting the black shouldn't stick to it? I should be able to wash it out or blow it out later? I was thinking of masking off the whole car from the bottom as an option. I have some of that whole car wrap. Will the white be cured enough to have some tape on it?

I don't know if I'm doing something wrong, but both the white and the black I shot has come out real shiny. This is what it looks like 6 hours after spraying:
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Took 1 1/2 gallons (sprayed 3/4 epoxy 3/4 activator)
 
Looks great to me.
I would use the masking film before shooting the black.
 
From the good, to the bad...

If you remember from my long winded first post, I wanted to paint the bottom of the shell on Friday. I didn't induce enough to paint it Friday, it rained Saturday, I spent Sunday on the inside, so I went to do the bottom this morning.

In my initial inducing on Friday morning, I mixed up a batch of white and black epoxy, then after seeing how little I got covered with the white, I mixed more black Friday night. since there was onbly about 8 hours betweeen the two, and I didn't have enough large containers, I didn't mix the first and second batches to reset the induction clock.

Today I grabbed the first batch, and it had a large semi solid mass floating in the middle. The second batch looked OK, but it did seem like it may be a touch thicker than it should be. I thought about just "punting" and waiting for my next shipment of black, but instead I plunged ahead. It poured ok into the gun, and I really thought it would be OK. If it was thicker, it was such a subtle difference I couldn't really be sure.

As soon as I started to shoot it though, it just wouldn't cover right. There were these little bumps in it, which I think made me try to put it a little thicker, then it just kind of separated and rolled away from itself. I stopped, gathered my thoughts, checked the pressure at the gun and tried again, same result. Pictures below.

Do those with experience think the problem was it had induced too long, or do I need to be looking for another culprit? What do I do with the stuff on there? This is the bottom of the car where corrosion protection is the most critical. Do I need to blast it off? Scuff it? DA it? Just paint over it and sand the second coat?

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It's applied too wet in those spots. Sanding and respraying will fix it.

Semi-solid mass floating in the middle? That's a new one on me. Maybe it shouldn't have been used.
 
did you remove chunk mix it real good and strain it before you sprayed it?
 
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