- In this video, we're gonna talk about
why you may be block sanding your primer
but you keep sanding through to metal.
So, I had a question on YouTube.
Fred Jones asks, "Thanks brother. Great video, as usual.
"My issue is I have a small area where I sanded through.
"You told me to use etch primer, then primer surfacer,
"then block with 320.
"Every time I block sand with 320,
"it takes the primer surfacer and the edge primer off again.
"I use three coats of primer surfacer
"and a light coat of etch primer.
"I do have Epoxy primer, beige color.
"Should I try that over the bare metal
"and then primer surfacer, and then block with 320
"to see if I get different results?
"This is new to me and I'm not giving up, please help."
So, the problem you're having is you're block sanding
and metal keeps showing up.
And I don't think it's the type of primer.
I mean, you do want to use either etch primer
on bare metal, Epoxy, you know, either one,
your preference, or you know, a primer surfacer
that is direct to metal, that is designed to go to metal.
If you just put primer surfacer on top of metal
and it's not a DTM, direct to metal,
you're not gonna have the corrosion protection
that you should have.
But I don't think this is your problem right now,
the type of primer.
Reading this, I think you're having a problem
with the high spot, there's a high in the metal.
And I think this, just to back up a little,
I'll give you how you might fix this for now,
but to back up a little, I think this is the problem.
Whenever doing your metal work,
there's probably a dent there.
And anytime there's a dent, and there's a low
and then there's a high, just like if you laid down
on an air mattress, you know how when you lay down,
it pushes up somewhere else?
Or like water, you know, something splashes in the water,
it usually makes ripples or waves?
Well, metal's the same way.
When something causes it to go down,
there's usually a high somewhere.
And that high is kind of your secondary damage.
It's not real noticeable, it's a little harder to find
than the direct damage, which is the dent.
You know, you can see that and a lot of times,
and I've seen this a lot, where you try
to raise that low out and you do.
And here's your high and here's your low.
You raise the low out, but then you just
raise that high up, too, and it's still,
you know, effecting the surface.
And it's easy to miss because it's not real noticeable,
but when you go to do your body filler work,
you know, that spot's gonna keep hitting,
or, you know, going to bare metal again.
And then whenever you start doing your priming and blocking,
that high spot's just gonna keep sanding off
and there's really no way to fix that
unless you go back to straightening your metal.
Now, what you may do for right now, to see if it works,
if it's just a very minor high area there,
get, like a pick hammer and use this part right here
and just lightly tap on that metal
that keeps sanding through every time.
And you don't want to hit it hard.
You're just wanting to try to lower that a little bit,
so when the next time you prime and block it,
maybe it won't sand through again.
But I think, after reading this,
I think that is the problem you're having is maybe you're
not paying attention to that secondary dent
and this is a common mistake,
I mean a lot of people do this.
You have a tendency just to raise that direct damage out.
But the way to do this when you're straightening your metal,
as you're trying to raise that low out, you know,
feel the metal with your bare hand,
make sure it's the flat of your hand, not your fingertips.
And kind of find, identify where that high's at.
And as you're trying to raise that low,
tap down on that high, so that way
as you're raising the dent, you're moving the high
at the same time and that will eliminate you
from having that problem.
So, that's a common problem, a great question
because I do see that quite often.
And it's just something you have to get used to
is trying to find that indirect damage,
to locate it and work the highs down
as you raise that metal.
So, give that some thought as you're doing
any more metal work.
Like I said, that is, the indirect damage,
the highs are a lot harder to find,
they're not visible to you like the direct damage,
you know, like the dent.
But if you'll concentrate on that.
Now, it's actually more important
because like this problem you're having,
if you don't raise that down,
it's just gonna keep popping out on ya.
Now, if it's a little bit low,
you know, that's gonna fill in.
So, that won't give you problems.
But the highs are just gonna keep reappearing.
And if this is not the issue you're having,
if I didn't read that correctly
and maybe it's something a little different
than I thought, you know,
be sure and leave another comment below
and I'll try to further answer that question.
But I'm pretty sure, and I've seen it, you know,
I've seen that happen a lot, that that is your problem.
So, hopefully that helps.
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and I'll try to answer them, either by typing
or, you know, if it's too, like this would be too hard
to really discuss or explain, you know,
in a comment, so I'll make a video in it.
But anyway, thanks for watching.
Take care and we'll see you in the next video.