How to repair cracked bumper! fiberglass front bumper 3m filler tricks

How to repair cracked bumper! fiberglass front bumper 3m filler tricks

Have you ever went into the grocery store
picking up your eggs and milk?
Everything is going just fine until you walk
out into the parking lot and notice somebody
has hit your car.
Well today is your lucky day!
We’re gonna show you how to fix your fiberglass
or your plastic bumper!
So you come out of the grocery store and this
is what you’re left with!
A hole in your bumper.
This bumper today that we are working with
is fiberglass but you can also prep plastic
pretty much the same way.
What I’m saying is that this is not a lost
We are going to be able to repair this and
not have to replace this whole bumper cover.
A few things you’re going to need to fix your
spot up there.
Is, we got a little right angle 3 inch grinder,
(like a 36 grit pad).
Definitely some gloves cause that’s itchy!
We don’t need to be breathing that stuff in
so a dust mask.
And definitely last but not least safety glasses.
So the first thing we’re gonna do is we’re
gonna grind the back, grind the front, blow
it off and get this thing ready for fiberglass!
Everything you put on, you want it to adhere.
If you just put it right over the existing
material, its not gonna take!
So always rough everything up.
We got our work area grinded down, so now
we’re gonna take a little air and blow it
Now what we’re gonna do is get us some cloth,
cut it down, mix us up some resin and start
repairing our hole!
This is the cloth which is a lot more workable
and friendlier to use.
Cut it to whatever you feel fit for your project
or your job.
This is more like a backing.
Or like I said not much strength.
This is called matting.
Which you can see is a lot heavier with a
lot more fibers in it.
This here is for strength and also (just like
the cloth) in big quantities.
Cut it down to size of your repair.
This is our resin.
Gonna add a little hardener.
You put this in to help set the resin up or
else it will never dry if you don’t put that
Cheap brush and then a paint stick because
all these will go in the garbage.
For sure ; rubber disposable gloves, because
you do not want this resin on your skin.
Its a bear to get off!
Always shake your resin up a little bit, give
it a good little shake.
I only got these two pieces so I’m just gonna
guess I’m not gonna act like a scientist!
We’re gonna just throw a little bit in here.
Treat this like Bondo.
Its kinda cool out, so add a little squeeze
or two to your resin.
We got our couple pieces of cloth which we’re
gonna soak with everything here.
To apply onto the back of the bumper for our
I like to saturate the back area with the
It kinda helps hold the cloth in place.
Don’t be stingy with it neither!
Be careful, like I said do not get this on
your skin!
Just make sure you soak this real good!
You soak the cloth all the way through.
That looks great to me!
So now is the fun part!
Time to get dirty!
This is the only way of doing this!
Just do a little dabbing.
Just check to make sure there’s no air pockets
in between the panel and your piece of cloth.
And just keep that piece wet.
So we’re gonna let our fiberglass dry.
But while we’re on the subject of bumpers,
plastic bumpers, the prep is kinda the same.
But the other options are: plastic fillers,
you have plastic welders, (which will actually
weld the seam back together).
Hot water; you can sometimes get dents out
if you can get behind it.
Just don’t be discouraged because most of
the time you can fix and not have to replace
So you will save time and get a little hands
So our fiberglass repair is drying.
We got a pretty good void, so we’re gonna
use this “kitty hair” which has fibers that
help lock this material together.
And also this is good to use because it is
water resistant.
We got this good and mixed up, so lets go
apply this to our bumper!
Get it as smooth as you can because that’s
less sanding!
So we got us a good coat of our fiberglass
filler on here.
So we’re gonna let it set up.
With body filler you really have to be careful.
Try not to get it on your skin.
Sometimes it’s accidental and it does happen.
But you will know!
Because the chemical reaction of this stuff
is heat and sometimes it gets pretty warm,
so be extremely careful!
So we got us a piece of 80 DA sand paper.
What w’ere gonna do is knock down some of
the imperfections on our fiberglass for our
next application.
Right here we’re still a little low.
So what we’re gonna do, for sure, is we’re
gonna blow this off.
If you don’t blow none of this stuff off,
it’s a waste of time because you’re gonna
have dust in between your next application.
Which is not going to let it adhere properly.
This is bondo (which is not water resistant
like our fiberglass is.
Fiberglass is real porous so it will have
some big pin holes in it.
So this will fill any (like the low spot)
any pinholes.
So this is gonna be our next application.
A little tip on DA’ing, when you’re on the
surface keep the DA flat as possible.
You stand it on it’s edge, you’re gonna make
more work and pretty much waste your time
fixing your repair.
So remember flat!
Then when you’re done DA’ing, (or you think
you’re done) palm of your hand, not your finger
And rub over there and see if you can feel
any low spots and high spots.
We’ve switched over to 180 DA grit.
I wanna feather this out a little bit.
There’s a little bit of an edge because all
of the painting that’s been done has kind
of built up.
So I’m gonna sand past it.
So when I wipe my final wipe of glaze , it’ll
adhere to the panel.
The little layers like in a tree, they kind
of spread out more.
Now its nice and smooth so when I wipe my
glaze over it, you won’e even be able to tell
they were even there!
This is a final glaze and what this will do
is the high spots and low spots, (any imperfections
in the panel) this will fill in for our primer
Wipe this all the way out here.
That’s why I sanded past our body work.
You leave that little imperfection your gonna
have to sand that all the way down.
Which may require you to have to re skim this
whole area again.
So get it out, while the gettin’s good!
So hopefully this will be our final sand.
Then hopefully we can go behind, blow it off
and put some primer on it!
We’re gonna use a little bit of this aerosol
high build primer.
Usually a couple coats of this and it’ll fill
in any of your little imperfections like sanding
marks or anything.
We got our spot primer’ed.
Can’t even tell there was even a hole here!
And the rest of the machine will get prepped
for paint but if there’s anything we missed
or any questions, please share them with the
comments down below.
And don’t forget to subscribe.
And if there’s anything you need, don’t forget
to look us up at
Happy Fiberglassing!
I was doing a lot of fiberglass work.
When I was leaning, I was leaning into my,
that resin, that fiberglass resin.
So I’m sitting there messing around.
And that’s the same way that fiberglass resin
does the same.
And I mean I started!
I bolted to the bathroom!
When it starts setting up, you feel the heat!
So we got a couple pieces of cloth cut *spitting
and laughing.
If you’re testosterone is low, do fiberglass
work and it’ll build it right back up!
Hey you gotta watch what you say around here!
Hold on I gotta collect myself because you
really are getting on my nerves.
Happy place!
I don’t even like having these gloves on but
it is what it is!
All the tools we’re gonna use, we’re fixing
to get a cup, a brush, we’ve used scissors.
You suck at filming!
I’m just saying there’s no “do overs”.
I’m just saying this is, hey!
Like the turtle man says, this is “Live Action!”
Hold on Gus, you are, you’re annoying me already!
I just wanna know how to stand though.
I mean that’s my problem.
I wanna be comfy!
You gotta watch what you do Gus cause he’s
He’ll be like, “Hey dad this the kind of people
we got working here.
Oh I know he will!
I’m a prophet so, you don’t, I would really
appreciate it if you change your tone.
I’m sorry sir.
Cause this is the last time.
Hey, hey, I’ll be facetiming the owner of
this company.
My croissant is on the line!
I think he needs to go with you!
Just set that up on a tri-pod and I’ll just
do all this on my own.
Gus, I’m trying to get him to go Gus!
I know, we’re on our 3rd battery pack!

5 Replies to “How to repair cracked bumper! fiberglass front bumper 3m filler tricks”

  1. Awesome job man you made that look super easy and will definitely help me in the future thanks for sharing👍 just subscribed also✌

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