Aug
14

Collision Repair Training – How To Apply and Block Sand Body Filler or Bondo

 

body filler qr code1 150x150 Collision Repair Training   How To Apply and Block Sand Body Filler or BondoSCROLL TO BOTTOM FOR VIDEOS, THE  STEP-BY-STEP PROCEDURE AND ADDITIONAL RESOURCES. HOOK US UP BY SHARING THIS WITH YOUR FRIENDS. CLICK THE FACEBOOK BUTTON TO THE RIGHT.

First of all, let me explain what the difference is between bondo and body filler. Well, there is not a difference. Bondo is just a brand name. You may be saying there is a difference, some spread easier that others and some sand easier. That is true too! How can it be the same and different? Well, Coca-Cola and Pepsi are both a pop, right? But they are different at the same time. Body fillers are the same way. Bondo is just a brand of body filler. However, it has became a trade name. The reason that I post this first is because I get a lot of question about this. So there you go, now you know.

In the first training video, I will demonstrate how to mix and apply body filler to a damaged area.


0 Collision Repair Training   How To Apply and Block Sand Body Filler or Bondo

In the next video below I am demonstrating how to block sand body filler.  A common question that I get asked it how to sand body filler without it feeling lumpy or wavy.  There are a few things that will help you get a level surface.

The first thing is to cross sand.  I can not stress how important this is.  Sanding in only one direction allows your block to follow waves.   Kind of like a ship at sea….going with the motion.  However, we don’t want to follow patters, we want to level them.

The second little bit of advice it to level before smoothing.  I think that students have the objective is to get the body filler real smooth.  However, switching to finer grits too soon will lead to lumpy body filler work.  Make sure to have surface completely level before switching to finer grits.

0 Collision Repair Training   How To Apply and Block Sand Body Filler or Bondo

Step-By-Step – 9 Step To Apply and Sand Body Filler

  1. •If the repair has been welded, mix and apply fiberglass filler to repair area.
  2. •Sand the filler with 36 grit.  There is no need to use a finer grit as body fill will be applied over the fiberglass.  All you need to level the glass filler.
  3. •Mix and apply body filler over the repair area.  Cover and extend body filler over fiberglass.  Do not extend the filler onto the paint surface.
  4. •Block sand (cross sand) the filler with 36 grit sandpaper.  (This step can be done before the filler is completely dry to reduce the amount of sanding required.)
  5. •Repeat step if there are still lows.
  6. •Allow to fully cure (15 to 20 minutes) and spray with guide coat.
  7. •Block sand (cross sand) with 80 grit sandpaper.  Sand just enough to remove guide coat.  If guide coat does not sand off in an area indicates a low and additional filler will be needed.
  8. •Optional: Either apply guide coat and block sand with 150 grit; Or, Apply a coat of finish glaze over entire repair area.  Remember, glaze can be applied over sanded paint too.
  9. •Finish filler or glaze by blocking with150 grit.

Check out our affiliate partners at Amazon for a selection of body fillers below when considering to buy body filler.  

If you need any product information, help or questions, I here to help.  Send questions to [email protected]

Learn How To Apply and Sand Finish Glaze Putty.  Visit Our Finish Glaze Training Page. 

 

Was This Tutorial Useful?  Please Let Us Know By Clicking The Like Button Below.  Thanks!

Comments

  1. This is a very helpful video. I wish a friend of mine would have seen a couple videos like this before he decided to paint another buddies car just a few days ago.
    He didn’t do much body work at all but when he did he never used a block, it was mostly his hand or power tools.You can definately see where he used his hand, but its not my car.

  2. This video was very helpful. An awesome refresher since I haven’t done body filler in years.

    You need to make that student that was texting during the whole video retake the class! LOL

  3. Excellent video, came just in time as I bought filler, sandpaper, da, etc. over the weekend and am getting ready to tackle an 87 silverado with dents and rust.

    Keep the videos coming, they are a tremendous help!

    Thank you

  4. Donnie,
    Nice Teaching. Clear and concise.

    Please post the next steps all the way to painting. We guys need to see the full process as it goes from looking worse to looking perfect.
    Next step you mentioned was DA feathering.
    I want to see that and then primer to block sanding it to final priming to sealing to paint.
    Hope you didnt stop your videoing there. We need to the entire process or it stops there in our minds.

    Thanks Donnie,

Trackbacks

  1. [...] HOW TO AVOID COMMON MISTAKES WHEN APPLYING AND SANDING BODY FILLER. Visit Our Auto Body Filler Training [...]

  2. […] How To Apply and Block Sand Body Filler – Tips To Help You Eliminate Common Mistakes. […]

  3. […] to begin with there wouldn't be a problem. But check it out, it's a darn good explaination. Body Filler – How To Block Sand Bondo On A Auto Repair […]

Speak Your Mind