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-Hey.
This is Donnie Smith, and welcome to this lesson
on spraying primers.
In the last video in this series,
we showed you how to mix up some Epoxy Primer,
now we're going to spray it on the car,
and then we're going to mix up some primer-surfacer
and apply that as well.
First, before we start to talk about spraying,
I'd like to talk about some of the mistakes,
the common mistakes that I see with spraying primers.
And probably the biggest mistake I've seen out
there is trying to put too much on, put it too wet,
too many coats too soon.
And that causes a lot of problems.
A lot of the problems that you have in paint
can come back to not enough flash time
or putting it on too thick.
That's why it's important to look at the technical data
sheet, and find out exactly what you're supposed to do.
And there's technical data information to the Epoxy
and the primer-surfacer at the end
of this video for the ShopLine.
Putting it on too thick, it can cause a number of problems.
But let's talk about one of the problems that can lead to.
If you've ever seen dry dirt or mud
that's dried and all the water has evaporated out of it,
it's all cracked up, well, you know, primers and paints,
they do the same thing.
If you put it on too thick, too heavy, it's going to dry,
and if there's a possibility that some of these products
can do that, and it could actually crack on you
and give you that cracked look just like dried mud.
Another thing that can lead to is solvent popping.
And what that is, is when you apply it on too wet,
the outside surface is already kind of dried
and what's underneath can't escape, can't evaporate.
So you've got all those solvents underneath and everything's
going evaporate sooner or later, and what
it does is, instead evaporating the way it should,
it later, after that top film is dry,
is it evaporates but it makes a whole where that evaporates at.
So there's like a tiny little pinhole in there.
And sometimes those can be very deep especially
if it was the first coat of primer or this is escaping at.
And so it's going to go through all that surface
and have a hole there.
Another thing, if you put it on too thick, too many coats too
fast, it could shrink on you.
So you might have it sanded down, it looks good.
And you paint it, and it looks good.
Then a couple days later, even weeks later, that primer
continues to shrink because it couldn't dry properly
and then you see repair mapping and sand scratch swelling
from where you did your body work.
All those can be eliminated if you'll just
follow the technical data sheet and not put it on too thick.
I know.
Most of us are all the same.
I mean, if a little bit does good,
we always think more is better.
I mean, I've tried vitamins, and well, I can't really
tell if that doing anything.
Let's try more.
But just like with medications, vitamins,
more is not necessarily better, and that's
the case in refinished products.
So always read that technical data sheet
and follow the recommendations because they're there
for a reason.
Now, I know I mentioned allowing it to flash the proper flash
time, what's the technical data sheet say about that.
Let me back up and tell you exactly what flash time is.
Flash time is the amount of time it needs to dry between coats.
So if you put a coat of primer-surfacer down,
and it says allow to flash 5 minutes,
you need to let that sit for 5 minutes.
Now, that is not an absolutely, and let me tell you why.
These technical data sheets are written in a lab,
in a testing environment.
It's usually 70 degrees.
So when they do this, it dries 5 minutes at 70 degrees
Fahrenheit, and that's the amount of time it takes.
Now, like today, out here in my garage, it's very hot.
It might not take that long.
It's going to decrease the amount of time it has to flash.
And if it's really cold, it's 56 degrees in your shop, well,
you're going to increase that time quite a bit.
So always take into account the temperature
that that's going to affect that as well,
but that's a good starting point is look at the technical data
sheet, but remember that's at 70 degrees.
So flash time is the time in between coats.
Now, the window is how long you have
before you can re-coat on top of that without having to sand.
For example, Epoxy has a real long window
of 72 hours, the one I'm using anyway.
Most of them do.
So you have three days to come back with your primer-surfacer
or whatever you're putting on top of that to spray it.
And during that time, during those three days,
you can spray right on top of the Epoxy.
It has a chemical bond, a chemical adhesion,
but if it goes longer than the 72 hours are to three days,
you're going to have to sand that scuff it up lightly
to give it a mechanical adhesion.
So when following the steps in this video,
we're going to spray the Epoxy on.
We're going to allow it to dry the recommended time,
then we're going to come straight on top of it
with the primer-surfacer, and then
we're going to allow it to dry.
Then we're going to block it out and get it ready for painting.
Again, if you want the specifics, the technical data
information on Epoxy, on primer-surfacer,
at the end of this video, there will be some resources for you
to click there where you can get to those videos
where I'll go over the entire technical data sheet for you.
OK.
Let's get started.
OK.
We've got the primer mixed up.
And the way this works, you have to buy
this adapter that goes with the system.
And you just push this lid on here.
And the nice thing about this is, is when you're done,
you just take this off.
You can throw the lighter away, and then
you just have your gun to worry about cleaning.
You don't have to keep a cup clean.
What I'm going to do is wipe this down with wax and greaser
maybe one more time.
Making sure that you are working on a clean surface
is an important part and ensuring good adhesion
and preventing problems like fish eyes and things like that.
We'll let that flash off for a little bit and dry.
And then this is the way we prime it.
We just have an old tack rag.
I wouldn't necessarily get a new one for it.
So you can just slightly go over it with the tack rag.
Make sure some of the dirt is off.
Then also with primer, you always
want to make sure that you do wear a proof
respirator for spraying, and you also
want to be in an area like this, in a prep station or a tank
booth and that you have your fans on.
As you can see, we've got our first coat on
and it's flashing off.
Be sure and check your procedure pages
to see what the flash time should be in between coats.
And we're going to go ahead and put two coats of this Epoxy
Primer on, the first coat we went the full length of this,
the second coat, we're going to come back a little bit
and not go quite as far.
And what that does is allows a thinner
build to be here so that you don't have a hard edge when
you're trying to block sand this out.
All right.
We've got the gun clean and now the washing down.
We'll go ahead and wipe if off a little bit.
And now we can get ready to go ahead and put
the primer-surfacer.
In this particular job, we're going
to use ShopLine, a JP202, which is a primer-surfacer.
And what that is used to do is to fill the scratches
and we block it out and make a nice, smooth surface.
So like I said, you always want to be sure and look over
your procedure pages.
If you notice on this, it shows that we put two coats on,
so you might wait at least 30 minutes before applying
your primer-surfacer.
And you have up to 72 hours, which
is three days, to go ahead and apply the surfacer.
If you go longer than three days or 72 hours,
you'll have to scuff the surface to provide
a mechanical adhesion rather than the chemical adhesion.
So we're going to mix up about the same amount.
And if you look over here on 202,
and depending on the products you're
using, wherever you buy the products,
be sure and ask for these procedure pages
so that you can look at them, and it tells you
how many coats should be applied, the flash time,
things like that.
So here it shows that you mix it 4 to 1,
so it means 4 parts of JP202 to 1 part catalyst, which
is 301 for this application.
So we're going to mix this 4 to 1.
So you look on here.
Find the 4 to 1 and probably we'll just go 2 and 2,
2 parts here to the catalyst.
So there's our primer-surfacer, catalyst in.
It's always a good idea to be sure to put these lids on
immediately, because this catalyst is moisture sensitive,
and you don't want that lid left open.
Now, I can sit the Epoxy Primer for the one that
takes the induction time.
This is primer-surfacer.
There is no induction time as soon as it's mixed.
Go on and spray it.
Put your lid on.
And you want to be sure and always put this ring on.
It has been left off before, and without that, that lid
is not going to stay on there.
Put it on.
Now, we're ready to apply our two coats of primer-surfacer.
OK.
As I mentioned, if we've waited at least 30 minutes
and not no longer than 72 hours, we can just come in,
and we can spray right over that.
You can tack it if you want to, but it is ready to spray,
so we're going to pick up our paint gun, turn our fan on.
OK.
I just had a problem.
I don't know if you saw it on film,
but we had a drop that dropped on the car,
and I stopped to see what the problem was.
And what happened is I had the liner here,
and this will happen if you're not careful.
And I popped this on and wasn't paying attention.
And when I did, can you focus in on that?
I kind of caught the edge of that and pushed it in.
And this got kind of pushed down in there
just a little bit, which didn't make the seal.
And then I put everything on.
So make sure that this does stay on top here.
And that probably had I opened the gun up and just put it back
on top.
Make sure.
This doesn't happen often, but every once in a while
if you're not paying attention, that will happen.
So that was a mistake that we can learn right here.
Try to avoid that.
OK.
I went ahead and got the first the first coat on.
Let it dry for a little bit, and then we'll
come back and put our second coat on.
Now, if you've been watching my videos for a long time,
you may realize these videos, I shot a long time ago.
However, listening to your comments and your feedback,
you really enjoyed this series of videos.
But there's a lot of complaints about them
because the audio wasn't too good,
and I tried to enhance that the best I could, plus I'm putting
in this intro and talking about some of the question
you had in the beginning and ending of these videos.
So hopefully, you found that useful.
Another question I got a lot from this video from years ago
is, what kind of primer gun do I recommend?
And there's a lot of good primer guns out there.
You just need a 1.6 to 1.8 range.
You know, it's a little bit bigger gun
than what you're going to shoot base coat with.
Base coat is going to be like 1.3 to 1.4.
And for primer, I'd use 1.6 to 1.8.
3M makes some good primer guns.
This is a DeVilbiss.
They make some good ones.
Me personally, I have started using 3M's Accuspray primer
gun.
Some people really liked it, and some don't.
I've heard good and bad about it.
Me personally, I love the gun.
It's true that you don't have to have atomization quite as
well as you do when you're shooting
base coat or clear coat.
But you still want a gun that can spray it really nice.
For example, in this video, I showed you
how to mask off and back mask, but I mean,
if you've got a small spot in the fender,
it's possible that you could just
spray that fender and maybe not even mask.
What you're going to do is, you're going to turn your gun.
You're going to fine tune it to a smaller pattern,
and then you're going to prime just that area.
You're going to keep that repair area real small.
And so you want a primer gun that's
going to shoot good if you need to do that,
and a lot of times, that's what you may do rather than masking
off the way we did in this video.
But if you're a beginner, I would
recommend going ahead and taking every precaution until you
become comfortable enough to know what your limits are.
If you're unsure, go ahead and mask it off.
Drop a piece of plastic over the entire car
just like we did with this video,
because it's always better to be safe than sorry
just to save a few minutes.
If you enjoyed this video, I'd really
appreciate it if you go down below, give us a like,
give us a thumbs up, and be sure and tell others
about this video.
Thanks for watching, and remember, if something's worth
doing, do your best and have a blast doing it.
Hey.
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