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working with bondo for the first time

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1.4K views 7 replies 6 participants last post by  Crpt_keeper  
#1 ·
auto body friend of mine gave me a bunch of bondo to help me fill in dents and stripped away paint where i took out rust, problem is ive never worked with bondo before. he told me how to mix the hardener and things like that but if anyones ever worked with it can you give me some advice?

like how long do i have to put it on after i mixed the hardener into the bondo im using?
 
#2 ·
People can always give you tips on what to do but I think it comes down to the simple fact that you have to do it yourself and learn. I'm not a body guy, nor have I ever messed with bondo but I would assume that's how it works.
 
#3 ·
People can always give you tips on what to do but I think it comes down to the simple fact that you have to do it yourself and learn.
Well said! OP---do you have the can it came in? Read the directions. I've only done bondo once--a little more than a year ago. Pretty simple if you're patient. Don't rush things. Get a rasp. It's like a cheese grater for bondo. Get some beer too. Good luck with the project. You can do it!
 
#5 · (Edited)
auto body friend of mine gave me a bunch of bondo to help me fill in dents and stripped away paint where i took out rust, problem is ive never worked with bondo before. he told me how to mix the hardener and things like that but if anyones ever worked with it can you give me some advice?

like how long do i have to put it on after i mixed the hardener into the bondo im using?
I am actually been in the process of doing body work also. I have used Bondo allot over the years and learned a couple things that really help.

1. When filling in dents, drill little holes in the crevices to give the bondo something grab onto.

2. Be sure to sand to bare metal before applying Bondo on the area you want to cover.

3. Clean, clean, clean, and then clean the area again before applying.

3. Buy some glazing putty it will be your best friend, apply on top of the bondo after sanding, the glazing putty is thinner then bondo and will fill any imperfections left after sanding. Once dry sand that smooth.

3. Apply high build primer liberally to make sure you cover any left over imperfections. After the first couple coats, you will still see the bondo underneath keep spraying and sanding until you can’t see, or feel the bondo.

4. Be patient, don’t slack on the sanding. Bondo can be your best friend or worst enemy. It can cover imperfections if done right, or make them worse if not done right.

5. make sure you have about 2-3 times the amount that you actually think you will need. You will waste alot of it.

All in all take your time, and rejoice to the fact that your making your car a little nicer
 
#6 ·
I am actually been in the process of doing body work also. I have used Bondo allot over the years and learned a couple things that really help.

1. When filling in dents, drill little holes in the crevices to give the bondo something grab onto.

2. Be sure to sand to bare metal before applying Bondo on the area you want to cover.

3. Clean, clean, clean, and then clean the area again before applying.

3. Buy some glazing putty it will be your best friend, apply on top of the bondo after sanding, the glazing putty is thinner then bondo and will fill any imperfections left after sanding. Once dry sand that smooth.

3. Apply high build primer liberally to make sure you cover any left over imperfections. After the first couple coats, you will still see the bondo underneath keep spraying and sanding until you can’t see, or feel the bondo.

4. Be patient, don’t slack on the sanding. Bondo can be your best friend or worst enemy. It can cover imperfections if done right, or make them worse if not done right.

5. make sure you have about 2-3 times the amount that you actually think you will need. You will waste alot of it.

All in all take your time, and rejoice to the fact that your making your car a little ricer
:lol:

But yes, 91 said it perfect. Do not rush things or youll only make it worse. Body work isnt to hard its just time consuming. Let stuff dry properly before sanding, Don't cake it on, make sure you mix hardener/bondo correctly or you may just end up wasting it. Eitherway take er slow and do it nice.
 
#8 ·
Very Smart..
NEVER Bondo when its raining unless your in a controlled environment
The last thing you need is extra moisture.

I've used bondo alot over the years and the only thing I would add to the advise you have already gotten. Wear old crappy cloth's when you are sanding and definitely wear at least a paper mask.

When laying down the bondo lay it on as flat as possible, use the biggest applicator you can. Not to imply you should spread bondo everywhere, just that as you go over a dent and then off the extra bondo will roll out and the wider applicator will clean it better.