Learn Auto Body – BMW Body Kit Body Work Process – Part 8 – Bondo Shaping and Sand Paper Grits

Hey! What’s goin’ on!

Just posted a leaked video from the LearnAutoBodyAndPaint VIP Members Area to give you a sample of some of the trainings that you get access to as an EXCLUSIVE VIP Member.

This is a part of our BMW M5 Body Kit Project which is a 15-video series. It shows the complete body kit body work process.

Don’t forget your FREE 85-Page Auto Body And Paint Manual and your FREE 90-Minute Auto Body And Paint DVD. You will love all the helpful tips and info I’ve included in them.

So go ahead and watch the video now, make sure to share this with your friends. If you want to read the transcript, you can find it below.

Hope you like it!

Talk soon!




Alright, cool. So, all I’m using here is an 80-grit sandpaper basically you know, stuck in half like you’ll get a disc, right, a circle disc – you stick it in half so you have a half circle, right. And then you just tear pieces of it off and then fold that.

You see how I have like a little teardrop shape there? You want to keep that bubble there because you can use that and to go in seams like this. This is what you want to use it for. And this is where bodywork gets a little tedious but it’s fun. This is where you get a lot of detail work done and it’s pretty neat. So, take your time…do little tedious stuff like this with your seams, take your time and just do a good job because this is where detail comes in. And if you do crappy jobs in  corners like this – take shortcuts and just not care, it’s gonna show in your final product.

Take your time, make sure you get it nice, fill it out, you know you’re gonna have to probably do some more filling – put some bondo in your fingers and use them to fill certain sections but it’s all good. You know, this is what we’re doing it for – to do a really good job and have everything look like a PRO job.

Once you see this thing finished, you’re gonna say. “Wow”. Alright, so let’s go ahead and finish this up and we’re basically gonna finish up laying our bondo, our second coat of bondo on this. So we’re gonna go ahead, sand everything down, give it a second coat of bondo and then in the next videos, be ready for primer and all that other good stuff.

Here’s another cool tip. You can basically use a sheetrock knife or a razor blade to cut away corners or bondo spots that you’re trying to carve out. You know what I mean. Especially in corners, just carve it out. Okay. And then you go in there with a piece of sandpaper and finish it off. But this is just another trick, you know, you use tools, alright. It’s not the stone age here. You know if you have a sheetrock knife or a razor blade or a knife in your pocket, just use it to cut and to shape. The thing is a tool.

Okay, so it’s looking really good. Check out this seam here, you can see the dark areas – those are all the low spots. We’re gonna mix a little bit of putty now, fill those areas with our finger quickly, right, and sand it down and then fill the rest of our spots or on the bottom here, you can see the bottom part of the body kit. We’ll fill all that and then, cut it down once more with 80-grit, shape it then start priming it and go into the next stages, alright.

So, it’s looking really good. I’ll see you as we move on.


Here is the live example of the sanding seam out with our 80-grit. Just bend the paper. We left that loop like a little teardrop loop and we’re using that to create the curve to sand between our lines here. Now, you don’t want to completely fold your sandpaper ‘coz you’re gonna have a sharp edge but your wanna do the trick – keep it like a teardrop shape you can push with your pressure of the paper and get that loop to do the sanding for you.

So yeah, there is a lot of sanding involved in doing custom stuff and bodywork. It takes time but as you get through it, it’ll look really really nice, alright. Just take your time, go through it, feel the whole process out, feel all the body spots and just keep going, alright. It will eventually smoothen out, it will eventually look the way you want it to so keep on keeping on.


So what you see is a rough draft. I carved this section out right in here, to give it that look. I don’t know if you could see it finished but just look at the line, the line, that whole seam. I gotta do this side now. I didn’t carve that one out yet but I’m gonna do this one quickly on video camera. Hopefully, we could get it.


Okay, this area has to be filled in a little bit on top and also this here. We’re gonna fill it and we’re gonna cut it down. So all this needs to be cut down. Let me show you.

So if we take a look at it from here, we’re still high in here so we’re gonna have to get the bondo and blend it out up here a little bit. And then, reshape this and then fill in here as well as all the way across.

Okay, all in here looking low right in here because the bottom is a lot thicker. Okay, so we’re gonna have to fill all in here a little bit so we could blend it all in and then, up in here, if you can see.

The rest of it is looking good. We just have to fill this in and if we cut too much, we don’t want to cut too much here. We know these are high spots but they’re flushed, I can feel it, they’re flushed, they’re not popping out. We didn’t cut it down too much.

We got all this cut in here, you could see it’s how shaping up. This side’s all set. That’s all set so probably another coat or two of bondo. This is looking good. We’re gonna fill the middle up one more time.

This section we cut.

I may have to change that style, that look over there a little bit. We may have to come in more, make it rounder, make it come in like this ‘coz the other one looks like it comes out like that.

And then, we sand all this down. We just have to fill these little areas, build this up because it broke. That whole top is done.

So it’s just basically putting more putty on now and shaping it but it’s looking good. Once this thing is all primed up, we’re gonna see the real shape of the new-looking bumper, okay, but it’s getting there. It’s looking pretty cool. So see you in the next videos.


Alright, so basically our second coat of bondo right now, filling in the low spots. We’re gonna make sure that we get all the other spots and seam with our finger – go over everything and sand it down again and we should be in the home stretch, almost done and rockin’.

If you notice, it’s starting to lay on really nice now, you’re starting to see the flat part of the body panel. I was molding it into one piece. And look at the bottom deck lid area, that bottom strip where it’s all ready, it used to be very ripply. Now all that bondo there is all filled in, it’s all flat-looking now.

Once it starts looking like that, you know that it’s flat, okay. So let’s just finish up laying this bondo on. It’s looking really really good at this point. One more hit down with a DA, get it nice and flat then we’ll block-sand it out and then, ready for primer. So, let’s goin’.



Other Helpful Links:

Get A Free 90 Minute Auto Body DVD Here

How To Auto Body And Paint Q&A – Part 1

DIY Auto Body Work And Painting Q&A – Part 2

How To Paint Cars – Q&A Part 3

How To Block Sand Primer Flat

How To Pinstripe A Motorcycle Tank

How To Paint A Motorcycle Yourself

Preview Finished BMW Body Kit Video

Warwick Spray Gun Review (what we use to paint at LABAP)


Leave a Comment